КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ
It was determined the chemico-analytical characteristics and composition of the complexes formed in the Mo(VI)–DOCh systems. The composition of the complexes (Mo(VI):DOCh = 1:2) was found by spectrophotometric methods (molar ratios, equilibrium shift). A probable complex chemistry was proposed based...
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| author | Chebotarev, Alexander Barbalat, Dmytro Guzenko, Olena Zherebko, Mariya Snigur, Denys |
| author_facet | Chebotarev, Alexander Barbalat, Dmytro Guzenko, Olena Zherebko, Mariya Snigur, Denys |
| author_institution_txt_mv | [
{
"author": "Alexander Chebotarev",
"institution": "Одеський національний університет імені І.І. Мечникова."
},
{
"author": "Dmytro Barbalat",
"institution": "InterChem, Odessa I. I. Mechnikov National University"
},
{
"author": "Olena Guzenko",
"institution": "InterChem, Odessa I. I. Mechnikov National University"
},
{
"author": "Mariya Zherebko",
"institution": "InterChem, Odessa I. I. Mechnikov National University"
},
{
"author": "Denys Snigur",
"institution": "InterChem, Odessa I. I. Mechnikov National University"
}
] |
| author_sort | Chebotarev, Alexander |
| baseUrl_str | https://ucj.org.ua/index.php/journal/oai |
| collection | OJS |
| datestamp_date | 2026-07-22T08:23:42Z |
| description | It was determined the chemico-analytical characteristics and composition of the complexes formed in the Mo(VI)–DOCh systems. The composition of the complexes (Mo(VI):DOCh = 1:2) was found by spectrophotometric methods (molar ratios, equilibrium shift). A probable complex chemistry was proposed based on a combination of spectrophotometric and mass- spectrometric data. It was shown that the MoO22+ cation acts as a complexing agent, and the ligand enters into the reaction in the form of an anhydrobase. It was found, that halogen-containing derivatives of MPDOCh form more intensely colored and stable complexes with Mo (VI) than MPDOCh, and the optimal pH of complexation shifts to a more acidic region. The study of the complexation of molybdenum(VI) with 6,7-dihydroxy-4-methyl-2-phenylchrome-nilium (MPDOCh) and its chlorine and bromine derivatives containing a halogen atom in 4th position in phenyl ring was shown that  MoO22+ cation acts as a complexing agent, and the ligand involved into reaction in the form of an anhydrobase. The analytical characteristics of the resulting complexes were determined, and it was also noted that the halogen derivatives of MPDOCh form more intensely colored  and  stable  complexes  with  Mo(VI). |
| doi_str_mv | 10.33609/0041-6045.86.3.2020.26-34 |
| first_indexed | 2025-09-24T17:43:24Z |
| format | Article |
| fulltext |
Неорганічна хімія
26 ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3
UDC 543.4:539.2 doi: 10.33609/0041-6045.86.3.2020.26-34
A.N. Chebotarev*, D.O. Barbalat, M.V. Zherebko, E.M. Guzenko, D.V. Snigur
COMPLEXATION OF MOLIBDENUM(VI) WITH 6,7-DIHYDROXY-4-METHYL-
2-PHENYLCHROMENYLIUM AND ITS HALOGEN DERIVATIVES IN
SOLUTIONS
Odessa National I.I. Mechnikov University, 2 Dvoryanskaya Str., Odessa, 65082, Ukraine
* е-mail: alexch@ukr.net
The complexation of molybdenum(VI) with 6,7-dihydroxy-4-methyl-2-
phenylchromenilium (MPDOCh) and its chlorine and bromine derivatives containing a
halogen atom in 4th position in phenyl ring was studied. The composition of the com-
plexes Mo(VI) : L = 1:2 was established by classical spectrophotometric methods.
Based on a combination of spectrophotometric and mass-spectrometric data,
complexation way is proposed. It was shown that MoO2
2+ cation acts as a complexing
agent, and the ligand involved into reaction in the form of an anhydrobase. The analyti-
cal characteristics of the resulting complexes were determined, and it was also noted
that the halogen derivatives of MPDOCh form more intensely colored and stable
complexes with Mo(VI).
K e y w o r d s: 6,7-dihydroxy-4-methyl-2-phenylchromenylium; molybdenum(VI);
com-plexation; spectrophotometry.
INTRODUCTION. One of the significant
problems of chemical analysis is the control of
the heavy metals content in objects of various
nature. Polyvalent metals are of interest, in
particular, molybdenum, which is an im-
portant essential trace element that is part of a
number of metal enzymes involved in meta-
bolic processes. The most reactive forms of
Mo (VI) in acidic medium are molybdenyl
cations MoO2
2+, which can form complex
compounds mainly with O- and S-containing
ligands [1]. The state of analytical chemistry
of molybdenum and methods for its determi-
nation were considered in [1–3]. Effective
methods have been proposed for determining
Mo (VI), for example, atomic absorption [4,
5], voltammetric [6, 7], and mass spectromet-
ric [8]. However, these methods are costly and
require highly qualified service. Spectropho-
tometry remains the simplest and most com-
mon method for determining molybdenum [9–
12]. The possibility of colorimetric determina-
tion of Mo (VI) after its micellar extraction
concentration in the form of a complex with
salicyl fluorone and a cationic surfactant was
shown in [13].
As a rule, Mo (VI) interacts with hy-
droxyl-containing ligands — hydro-
xybenzenes, trioxyfluorones, and
dioxychromenols (DOCh) mainly in an acid-
© A.N. Chebotarev, D.O. Barbalat, M.V. Zherebko, E.M. Guzenko, D.V. Snigur, 2020
Complexation of molibdenum(vi) with 6,7-dihydroxy-4-methyl-2-phenylchromenylium …
ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3 27
ic medium [1-3]. The latter are of interest
because they form intensely colored and sta-
ble complexes with Mo (VI), W (VI), Bi
(III), Ga (III), In (III) and some other metal
ions [14, 15]. Using DOCh derivatives, sen-
sitive photometric methods for determining
Mo (VI) have been developed [15, 16]. In
turn, the potential for modifying the reagents
of this class has not been fully exhausted.
For example, the introduction of halogen
atoms promotes a shift in the pH of
complexation to a more acidic region and,
consequently, an increase in selectivity, and
also often leads to an increase in the contrast
of the reaction and the sensitivity of the de-
termination.
Based on the foregoing, the aim of this
work is to study the complexation of Mo
(VI) with halogen derivatives of 6,7-
dihydroxy-4-methyl-2-phenylchromenilium
in aqueous solutions; establishing the chem-
istry of their interaction, as well as determin-
ing the corresponding chemico-analytical
characteristics.
EXPERIMENT AND DISCUSSION
OF THE RESULTS.. Derivatives of
dihydroxychromenilia: 6,7-dihydroxy -4 –
methyl -2- phenylchromenilium
(MPDOCh), 6,7-dihydroxy-4-methyl-2-(4-
bromophenyl)-chromenilium (4'-Br-
MPDOCh), and 6,7-dihydroxy-4-methyl-
2- (4-chlorophenyl)-chromenilium (4'-Cl-
MPDOCh) perchlorates were synthesized
by condensation of equimolar amounts of
pyro-gallol A and the corresponding β-
dicarbonyl compound in acetic acid medi-
um with the addition of 50% perchloric
acid, according to the scheme:
The individuality and purity of the
synthesized compounds were confirmed
by high performance liquid chromatog-
raphy. We used an Agilent Technologies
1260 Infunity chromatograph with an Ag-
ilent Technologies 6530 Accurate-Mass
Q-TOF LC/MS mass detector (column
temperature 35 °С; DOCh concentration
in the analyzed solution 1 mg/ml; injec-
tion volume 2 μl; column - Zorbax
4.6×100 mm, 3.5 μm; mobile phase - ace-
tonitrile-0.1% aqueous solution of formic
acid, 60:40).
Absorption spectra in the range 380–
780 nm were recorded on Specord UV
VIS and SF-56 spectrophotometers in cu-
vettes with an absorbing layer thickness of
1, 2, and 3 cm. The acidity of the medium
was monitored using an ESL-63-07 glass
electrode paired with silver chloride com-
parison electrode EVL-1M3 on the I-160
ionomer, calibrated according to standard
pH buffer solutions.
DOCh working solutions with concen-
tration of 1∙10–2 mol/dm3 were prepared by
dissolving an exact weighed reagent in a
mixture of ethanol with dimethylformamide
(5 vol%). The initial Mo (VI) solution with a
concentration of 1∙10–2 mol/dm3 was pre-
pared by dissolving 1.7651 g of
(NH4)6Mo7О24∙4Н2О in hot distilled water,
after cooling to 20 °С bringing volume to 1 l
and standardized titrimetrically. Solutions
with lower concentrations were obtained by
diluting the initial one immediately before
use. Reagents of qualification not lower than
analytical grade were used, the required
acidity was created with solutions of sulfuric
acid and sodium hydroxide, and with the
help of acetic acetate buffer solution.
To optimize the conditions for the
complexation reaction, Mo (VI) and DOCh
A.N. Chebotarev, D.O. Barbalat, M.V. Zherebko, E.M. Guzenko, D.V. Snigur
28 ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3
Fig. 1. Light absorption spectra of MPDOCh
derivatives (dashed line) and their complexes
with Mo (VI): 4'-Cl-MPDOCh (a) and 4'-Br-
MPDOCh (b), Mo: L = 1:2, l = 1 cm.
solutions with a concentration of 1∙10–5 –
1∙10–4 mol/dm3 were mixed in different mo-
lar ratios in the pH range 1–8 (ΔрН = 0.5)
and the light absorption intensity was rec-
orded relative to the solution of the blank
experiment. The stoichiometry of the prod-
ucts of interaction was established by the
methods of isomolar series, molar ratios, and
equilibrium shift; molar absorption coeffi-
cients and stability factors were calculated
by the method [17]. Mass spectra were rec-
orded by the FAB method on a VG 70-70EQ
mass spectrometer using a beam of Xe atoms
with an energy of 8 kV.
Changes in the absorption spectra during
the complexation of Mo (VI) with different
DOChs are similar. Figures 1 and 2 show the
absorption spectra in the Mo (VI) –4′-Cl-
MPDOCh and Mo (VI)–4′-Br-MPDOCh
systems with the ratios Mo : L = 1:2. As
seen from fig. 1, the interaction of 4'-Cl-
MPDOCh with Mo (VI) is accompanied by a
bathochromic shift at 65 nm, 4'-Br-
MPDOCh with Mo (VI) – at 70 nm, which
indicates an increase in the length of the
conjugation chain.
When optimizing the conditions for the
interaction of Mo (VI) with MPDOCh deriv-
atives, the influence of the medium acidity
was first investigated (Fig. 2). The stoichi-
ometry of complexation was studied under
optimal conditions for the interaction of hal-
ogen derivatives of DOCh with Mo (VI) us-
ing classical methods: isomolar series, met-
al/ligand saturation, and, as an example,
Figure 3 shows the results of processing the
ligand saturation curves by the equilibrium
shift method. An analysis of these data, as
well as those obtained by the methods listed
above, allows us to draw a conclusion about
the formation of Mo (VI)–DOCh complexes
with a composition of 1:2.
The interaction products in the Mo (VI) –
DOCh systems were isolated in a solid state
and studied by mass spectrometry with ioniza-
tion by bombardment with fast atoms (Fig. 4).
In the mass spectrum of the Mo (VI) –
PDOCh complexes, a polyisotope cleavage
with a maximum at m/z 631 is observed, which
corresponds to the protonated MoO2L2 com-
plex. Signals are present at m/z 381 and 395,
indicating the cleavage of one MPDOCh mole-
cule and the corresponding MoO2L+ particle
and the protonated MoO(OH)2L complex.
A L+ ligand signal with m/z 253 and a set
Complexation of molibdenum(vi) with 6,7-dihydroxy-4-methyl-2-phenylchromenylium…
ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3 29
of matrix signals are also observed.
In the case of complexes of Mo (VI) with
halogen derivatives of MPDOCh, peaks of sim-
ilar ions are observed in the mass spectra.
Based on the obtained experimental re-
sults and published data on the state of Mo (VI)
and DOCh in solutions [8, 9], it can be as-
sumed that the complexation scheme has the
form of:
Fig. 2. The effect of pH on the complexation of
Mo (VI) with 4'-Cl-MPDOCh (a) and 4'-Br-
MPDOCh (b), l = 2 cm.
Fig. 3. Determination of the composition of Mo
(VI) complexes with 4'-Cl-MPDOCh (a) and 4'-
Br-MPDOCh (b) by the equilibrium shift meth-
od. CR = 4·10–5 M, l = 2 cm
The two anhydrobase molecules of the
corresponding DOCh form two bonds with
the molybdenyl cation through the carbonyl
oxygen at position 7 and deprotonated hy-
droxyl group at position 6. The basic chemi-
cal and analytical characteristics of the stud-
ied complexes are listed in the table.
According to the table, it can be con-
cluded that the introduction of halogen at-
oms into the reagent molecule shifts the op-
timal pH of complexation to the acidic re-
gion the stronger, the greater is the electro-
negativity of the halogen. The molar coeffi-
cient of light absorption and the contrast of
A.N. Chebotarev, D.O. Barbalat, M.V. Zherebko, E.M. Guzenko, D.V. Snigur …
30 ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3
Fig. 4. Mass-spectrum of Mo(VI) complex with MPDOCh
T a b l e
Formation conditions and chemico-analytical characteristics of the Mo(VI) complexes
with 6,7-dihydroxy-4-methyl-2-phenylchromenilium derivatives in solutions
Reagent Mo(VІ) : L рНopt λ, nm ∆λ, nm ε·10–4 lgβ
MPDOCh 1:2 2.5 485 50 1.3 11.23
4'-Br- MPDOCh 1:2 1.5 490 70 2.3 10.18
4'-Cl- MPDOCh 1:2 1.0 495 65 1.9 9.98
the reaction increase in the series MPDOCh
- 4'-Cl-MPDOCh - 4'-Br-MPDOCh, which is
associated with the effect of “weighting” of
the reagent molecule, and the corresponding
complexes can be effective analytical forms
for the development of methods of photo-
metric and extraction photometric determi-
nation of Mo (VI).
CONCLUSIONS. In this work, we de-
termined the chemico-analytical characteris-
tics and composition of the complexes
formed in the Mo(VI)–DOCh systems. The
composition of the complexes
(Mo(VI):DOCh = 1:2) was found by spec-
trophotometric methods (molar ratios, equi-
librium shift). Based on a combination of
spectrophotometric and mass spectrometric
data, a probable complex chemistry is pro
Complexation of molibdenum(vi) with 6,7-dihydroxy-4-methyl-2-phenylchromenylium …
ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3 31
posed. It was shown that the MoO2
2+ cation
acts as a complexing agent, and the ligand
enters into the reaction in the form of an
anhydrobase. It was found that halogen-
containing derivatives of MPDOCh form
more intensely colored and stable complexes
with Mo (VI) than MPDOCh, and the opti-
mal pH of complexation shifts to a more
acidic region.
КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ
(VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕ-
НІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕН-
ПОХІДНИМИ В РОЗЧИНАХ
О.М. Чеботарьов*, Д.О. Барбалат, М.В. Же-
ребко, Д.В. Снігур
Одеський національний університет імені
І.І. Мечникова, вул. Дворянська, 2,
Одеса, 65082, Україна
* е-mail: alexch@ukr.net
Досліджено комплексоутворення молі-
бдену(VІ) з 6,7-дигідрокси-4-метил-2-феніл-
хроменілієм (МФДОХ) і його хлор- та бром-
похідними, що містять атом галогену в по-
ложенні 4 фенільного кільця. Склад комп-
лексів Mo(VI) : L = 1:2 встановлено класич-
ними спектрофотометричними методами.
На основі сукупності спектрофотометрич-
них і мас-спектрометричних даних запропо-
новано хімізм комплексоутворення. Показа-
но, що комплексоутворювачем виступає ка-
тіон MoO2
2+, а ліганд вступає в реакцію у фо-
рмі ангідрооснови. Визначені хіміко-ана-
літичні характеристики утворених компле-
ксів, а також відмічено, що галогенпохідні
МФДОХ утворюють більш інтенсивно за-
барвлені і стійкі комплекси з Mo(VI).
К л ю ч о в і с л о в а: 6,7-дигідрокси-4-
метил-2-фенілхроменілій; молібден(VІ); ком-
плексоутворення; спектрофотометрія.
КОМПЛЕКСООБРАЗОВАНИЕ МОЛИБДЕ-
НА (VI) С 6,7-ДИГИДРОКСИ-4-МЕТИЛ-2-
ФЕНИЛХРОМЕНИЛИЕМ И ЕГО ГАЛО-
ГЕНПРОИЗВОДНЫХ В РАСТВОРАХ
А.Н. Чеботарёв*, Д.А. Барбалат, М.В. Жереб-
ко, Д.В. Снигур
Одесский национальный университет имени
И.И. Мечникова, ул. Дворянская, 2, Одесса, 65082
Украина
* е-mail: alexch@ukr.net
Синтезирован ряд галогенсодержащих про-
изводных перхлората 6,7- дигидрокси-4-
метил-2-фенилбензопирилия. Исследованы
особенности комплексообразования молиб-
дена(VI) с 6,7-дигидрокси-4-метил-2-
фенилхроменилием и его хлор и бромопро-
изводными, которые содержат атом галогена
в положении 4 фенильного кольца. Состав
комплексов Mo(VI):L = 1:2 установлен клас-
сическими спектрофотометрическими мето-
дами. Определены молярные коэффициенты
светопоглощения комплексов молибдена(VI)
с незамещенным и хлоро- и бромопроизвод-
ными перхлората 6,7-дигидрокси-4-метил-2-
фенилхроменилия, которые соответственно
составляют 1,3·104, 1,9·104 и 2,3·104. Рассчи-
тано логарифмы констант устойчивости, ко-
торые соответственно равны 11,23, 9,98 и
10,18. На основании совокупности спектро-
фотометрических и масс-спектрометричес-
ких данных предложен вероятный механизм
комплексообразования молибдена(VI) с про-
изводными перхлората 6,7-дигидрокси-4-
метил-2-фенилбензопирилия. Показано, что
при оптимальных условиях взаимодействия
комплексообразователем выступает катион
молибденила, а лиганд вступает в реакцию в
форме ангидрооснования. Определены хими-
ко-аналитические характеристики образо-
ванных комплексов, а также отмечено, что
галогенпроизводные МФДОХ образуют бо-
mailto:alexch@ukr.net
A.N. Chebotarev, D.O. Barbalat, M.V. Zherebko, E.M. Guzenko, D.V. Snigur
32 ISSN 0041-6045. УКР . ХІМ . ЖУРН ., 2020, т . 86, № 3
лее интенсивно окрашенные и достаточно
устойчивые комплексы с Mo(VI). Отмечено,
что молярный коэффициент светопоглоще-
ния увеличивается с увеличением молярной
массы соответствующих комплексов. Пока-
зано, что оптимальное рН комплексообразо-
вания сдвигается в кислую область тем силь-
нее, чем больше электроотрицательность
галогена в молекуле лиганда. Отмечено, что
новые комплексы молибдена (VI) с хлоро- и
бромопроизводными перхлората 6,7-
дигидрокси-4-метил-2-фенилхроменилия яв-
ляется электронейтральными и пригодными
для разработки экстракционных и сорбцион-
ных методик концентрирования микроколи-
честв молибдена(VI). К тому же, предлагае-
мые комплексы могут быть использованы в
качестве новых аналитических форм для
прямого спектрофотометрического опреде-
ления следовых количеств молибдена(VI) в
объектах различной природы.
К л ю ч е в ы е с л о в а: 6,7-дигидрокси-4-
метил-2-фенилхроменилий; молибден(VI);
комплексообразование; спектрофотометрия.
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Надійшла 25.11.2019
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| id | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-134 |
| institution | Ukrainian Chemistry Journal |
| keywords_txt_mv | keywords |
| language | English |
| last_indexed | 2026-07-23T01:01:59Z |
| publishDate | 2020 |
| publisher | V.I.Vernadsky Institute of General and Inorganic Chemistry |
| record_format | ojs |
| resource_txt_mv | ucjorgua/a4/36d9ae89694855f9c472bab6868b8ba4.pdf |
| spelling | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-1342026-07-22T08:23:42Z COMPLEXATION OF MOLIBDENUM(VI) WITH 6,7-DIHYDROXY-4-METHYL-2-PHENYLCHROMENYLIUM AND ITS HALOGEN DERIVATIVES IN SOLUTIONS КОМПЛЕКСООБРАЗОВАНИЕ МОЛИБДЕНА (VI) С 6,7-ДИГИДРОКСИ-4-МЕТИЛ-2-ФЕНИЛХРОМЕНИЛИЕМ И ЕГО ГАЛОГЕНПРОИЗВОДНЫХ В РАСТВОРАХ КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ Chebotarev, Alexander Barbalat, Dmytro Guzenko, Olena Zherebko, Mariya Snigur, Denys 6,7-dihydroxy-4-methyl-2-phenylchromenylium; molybdenum(VI); com-plexation; spectrophotometry It was determined the chemico-analytical characteristics and composition of the complexes formed in the Mo(VI)–DOCh systems. The composition of the complexes (Mo(VI):DOCh = 1:2) was found by spectrophotometric methods (molar ratios, equilibrium shift). A probable complex chemistry was proposed based on a combination of spectrophotometric and mass- spectrometric data. It was shown that the MoO22+ cation acts as a complexing agent, and the ligand enters into the reaction in the form of an anhydrobase. It was found, that halogen-containing derivatives of MPDOCh form more intensely colored and stable complexes with Mo (VI) than MPDOCh, and the optimal pH of complexation shifts to a more acidic region. The study of the complexation of molybdenum(VI) with 6,7-dihydroxy-4-methyl-2-phenylchrome-nilium (MPDOCh) and its chlorine and bromine derivatives containing a halogen atom in 4th position in phenyl ring was shown that  MoO22+ cation acts as a complexing agent, and the ligand involved into reaction in the form of an anhydrobase. The analytical characteristics of the resulting complexes were determined, and it was also noted that the halogen derivatives of MPDOCh form more intensely colored  and  stable  complexes  with  Mo(VI). V.I.Vernadsky Institute of General and Inorganic Chemistry 2020-04-07 Article Article Inorganic Chemistry Неорганическая химия Неорганічна хімія application/pdf https://ucj.org.ua/index.php/journal/article/view/134 10.33609/0041-6045.86.3.2020.26-34 Ukrainian Chemistry Journal; Vol. 86 No. 3 (2020): Ukrainian Chemistry Journal; 26-34 Украинский химический журнал; ##issue.vol## 86 ##issue.no## 3 (2020): Украинский химический журнал; 26-34 Український хімічний журнал; Том 86 № 3 (2020): Український хімічний журнал; 26-34 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/134/87 Copyright (c) 2020 Alexander Chebotarev, Dmytro Barbalat, Olena Guzenko, Mariya Zherebko, Denys Snigur https://creativecommons.org/licenses/by-nc/4.0 |
| spellingShingle | Chebotarev, Alexander Barbalat, Dmytro Guzenko, Olena Zherebko, Mariya Snigur, Denys КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ |
| title | КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ |
| title_alt | COMPLEXATION OF MOLIBDENUM(VI) WITH 6,7-DIHYDROXY-4-METHYL-2-PHENYLCHROMENYLIUM AND ITS HALOGEN DERIVATIVES IN SOLUTIONS КОМПЛЕКСООБРАЗОВАНИЕ МОЛИБДЕНА (VI) С 6,7-ДИГИДРОКСИ-4-МЕТИЛ-2-ФЕНИЛХРОМЕНИЛИЕМ И ЕГО ГАЛОГЕНПРОИЗВОДНЫХ В РАСТВОРАХ |
| title_full | КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ |
| title_fullStr | КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ |
| title_full_unstemmed | КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ |
| title_short | КОМПЛЕКСОУТВОРЕННЯ МОЛІБДЕНУ (VI) З 6,7-ДИГІДРОКСИ-4-МЕТИЛ-2-ФЕНІЛХРОМЕНІЛІЄМ ТА ЙОГО ГАЛОГЕНПОХІДНИМИ В РОЗЧИНАХ |
| title_sort | комплексоутворення молібдену (vi) з 6,7-дигідрокси-4-метил-2-фенілхроменілієм та його галогенпохідними в розчинах |
| topic_facet | 6,7-dihydroxy-4-methyl-2-phenylchromenylium molybdenum(VI) com-plexation spectrophotometry |
| url | https://ucj.org.ua/index.php/journal/article/view/134 |
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