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UDC 541.64:547.5644
SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF Fe(III), Mn(II) AND Cu(II) COMPLEXES WITH N'-MALEOIL-SALICYLIC-HYDRAZID
1G.H. Gondolova, 2A.A. Medjidov, 2P.A. Fatullayeva, 2A.I. Israfilov
institute of Ecology and Natural Resources Ganja Branch of the National Academy of Sciences of Azerbaijan H.Aliyev Avenue, 153, AZ 2003 Ganja, Azerbaijan; e-mail: gulnargondolova@gmail.com 2Acad. M. Nagiyev Institute of Catalysis and Inorganic Chemistry National Academy of Sciences ofAzerbaijan AZ 1143 Baku, H. Javid Avenue, 113, Azerbaijan
[Fe(CuH9N2O5)2(H2O)2]'3(C3H7NO) (1), [MnCnHgNO^HO^CHNO) (2) and [Cu(C11H9N2O5)2(H2O)2]'3(C3H7NO) (3)complexes have been synthesized and characterized by elemental analysis, FT-IR and EPR spectra, magnetic susceptibility and thermal analysis. All complexes show distorted octahedral geometry. In 1, 2 and 3complexes, metal ions are coordinated by means of two oxygen atoms of salicylic residue and two nitrogen atoms bonded with maleic residue and two water molecules.
Keywords: synthesis, Fe(III), Mn (II) and Cu(II) complexes, thermal behavior, magnetic properties
1. Introduction
Hydrazides of carboxylic and dicarboxylic acids are of theoretical and practical interest. An emphasis laid on these compounds is due, first of all, to their ability to change the dentation depending on reaction conditions and form both mononuclear and polynuclear complexes. N'-acylsalicyl-hydrazides contain two or three nitrogen and oxygen donor atoms which can coordinate with metal atoms and give rise to various structural types such as trinuclear polymer [1], hexanuclear, octanuclear, decanuclear and dodecanuclear metalladiazamacrocycles [2-4].
At present, quite a lot of theoretical and experimental data have been accumulated on the physical-chemical properties, composition and structural features of transition metal complexes. This is due to the fact that many of their coordination compounds have high
physiological activity to serve as a basis for creating promising materials. In particular, they are based on characteristic hydrazides complexes TB [5-6], anticancer [7-9], antimalaria [10] and antimicrobial [11-12] activity and bactericidal, fungicidal, and antiviral [13] effect.
The aim of our work is to search for ligands that form polynuclear complexes. With that end in view, we synthesized a N'-acylsalicylhydrazide ligand [(2-hydroxy-benzoyl) of hydrazinyl]-4-oxobut-2-enoic acid (H4L) by means of the method [14] based on the following: it is a potential heptadentate ligand with -OH, -COOH and -CONHNHCO-which can construct multinuclear coordination polymers with transition metals. However, as shown in the work, this compound together with Fe(III), Mn(II) and Cu(II) ions behave as a bidentate monoanionic ligand.
2. EXPERIMENTAL
2.1. Measurements
Note that IR spectra were recorded on a NicoletIS10 Spectrometer using KBr discs in the range 4000-400 cm-1. The 1H
13
and CNMR spectra were obtained on a
BrukerDPX-400 Spectrometer using MeOD-solvent at 300 K. Magnetic moments at 25°C were determined using the Faraday method with Hg[Co(SCN)4] as calibrant.
2.2 Synthesis of H4L (N'-maleoyl-salicylic hydrazide)
Salicylhydrazide was synthesized according to the literature procedure. Maleic anhydride (0.981 g, 10 mmol) was added to the solution of methanol (40 mL) with salicylhydrazide (1.52 g, 10.0 mmol) at room temperature. The reaction mixture was stirred. The reaction was over in a short time (5~10 min) with higher yields. The white crystalline product was washed with methanol, and dried on air. The purity of the ligand was checked by IR spectra, and melting point. Yield: 95% m.p. 1880C; Found: C, 52.8; H, 4; N, 11.2 %. Anal. Calcd. for: C11H10O5N2 C,
53.4; H, 4.2; N, 10.8 %.1H NMR (MeOD), S ppm: 7.92 (d, 1H, o-PhCH); 7.46-7.43(m,1H;p-PhCH), 6.98-6.96(m, 2H m-PhCH), 6.41-6.39 (m, 2H; -CH=CH-); 13C NMR (MeOD), S ppm: 166.92 (-COOH-), 166.03 (-CO-PA), 163.54 (Ph-CO-), 158.53 (PhC-OH), 134.01 (-nhco-CH=), 131.76 (p-PHC), 129.94 (=CH-cooh), 128.82 (o-PhC), 119.25 (m-Ph), 116.77 (PhC-CO-), 114.74 (m-PhC-c-oH); IR (KBr pellet, cm-1): vN-H, 3029vs; broad;vC=O, 1704s; vC=C, 1659 s; vC=N, 1610 s; vNC=O, 1525vs; SN-H, 1490vs; vC-OH (phenolic), 1228 s, 1160 s.
2.3 Synthesis of complexes 2.3.1 Synthesis of [Fe(H3L)2 2H2OJ 3DMF
Solution of H4L (0.25g, 0.1mmol) in methanol and DMF (2:1), and solution of FeCl3 (0.135 g, 0.05mmol) in methanol were mixed and stirred for 0.5 h. Then the solution obtained was adjusted to pH = 8-9 by NH4OH.
Further, the solution was stirred for 1 h and filtered. After slow evaporation of the mother solution within a month, a dark brown precipitate of 1 was obtained from the filtrate in 45% yield.
2.3.2 Synthesis of [Mn(H3L)2»2H2O]'3DMF
The complex was prepared in a manner similar to that used for 1; a brown precipitate was obtained in 55% yield.
2.3.3 Synthesis of [Cu(H3L)2*2H2O]*3DMF
The complex was prepared in a manner similar to that used for 1; a dark green precipitate was obtained in 62% yield.
3. RESULTS AND DISCUSSION
The ligand H4L was obtained by a method different from the one known in literature [10], under relatively mild conditions by reaction of salicylhydrazide with maleic anhydride in a methanol solution. The structure of the prepared hydrazide ligand was
studied by elemental analyses, IR, and :H and 13C NMR spectral studies. The results obtained are in good agreement with those calculated for the suggested formula, and the melting point is sharp indicating the purity of the prepared ligand (H4L) (Scheme 1.).
OH
I
C^=N-N^=C C-OH
I ^^
OH
Scheme 1. H4L a- diketo-form, b-mono-enolform, c-dienolform
3.1 Spectral characterization
Note that the IR spectra of thehydrazide ligand contain a strong C=O absorption band at 1704 cm-1 and N-H absorption band at 3029 cm-1. Bands at 1228 cm-1 is assigned to the stretching vibration of v(Ph-O). For all complexes, the absence of stretching band N-H and C=O is consistent with deprotonation of CONH groups and coordination with metal ions in enol form. Also, the characteristic absorptions at 1607cm-1 indicate the presence of C=N-N=C group (scheme 1-c). The complexing process
involves the oxygen of the carbonyl group of the salicylic residue and the nitrogen atom bonded with the maleic residue. Deprotonation and coordination can also be confirmed by band at 524-534 cm-1 (M-O bonds) and 406466 cm-1 (M-N bonds) respectively. Note that the absence of carboxyl absorption band is explained by the formation of strong intermolecular hydrogen bonds due between of O (carboxyl group) and H (phenolic), O (carboxyl group) and H (crystallization water).
3.2 Elemental analysis
2+
Elemental analysis data show that Fe , Mn
2+
and Cu ions form complexes of the composition M(LH3)2 (where M is the metal
2+
ion and LH3 is the singly ionized ligand). Fig. 1.
O
O
C
C
O
a
c
Fig. 1 The structure of complexes
3.3. Thermal Analysis (TG)
Thermogravimetric analysis showed that the decomposition of compounds occurs in two stages. The main weight loss occurs at the first stage within the temperature range 250-3500C (55-75%, depending on the nature of metal ion); at the second stage within the
temperature range of 400-6000C; the final decomposition takes place to form appropriate oxides. Note that the amount of oxides remaining after the decomposition corresponds to the content of metals in the complexes (Table 1).
Table 1. Some characteristics of synthesized compounds
Compounds Brutto-formula T 0C Elemental analysis, % Calc./anal. Mr, q\mol
C H N O M
I C11H10O5N2 i88 53.4 4.2 i0.8i 3i.59 - 250
52.8 4 ii.2 32 -
II C22Hi8OioN4Fe >260 47.65 3.25 i0.ii 28.88 i0.ii 554
47.45 3.28 i0.02 27.87 ii.38
III C22HisOloN4Mn >260 47.75 3.26 i0.i3 28.93 9.93 552.9
47.72 3.34 9.49 28.23 11.22
IV C22HisOioN4Cu >260 46.98 3.2i 9.96 28.47 ii.38 562
47.0i 3.i8 9.89 28.28 11.64
3.4. EPR spectra
The EPR spectra of all complexes in the polycrystalline state are practically symmetrical singlet indicating a high degree of symmetry around the metal ion close to the octahedral one. The intense signals observed in iron and manganese complexes are manifest on high-spin 6S ground state of Fe(III) ions
(d5-configuration) and Mn(II). The values of AH and g-factors for complexes 1 and 2 have values of AH = 1400 G and AH = 800 G and g = 2.02 and g = 2.014 respectively. As for the Cu(II) complex (3), the line width peak to peak is AH = 350 G, and the g-factor is 2.12.(fig.2).
3.2. Magnetic susceptibility
The iron complex shows the value of copper - 1.9 B.M. It revealed that the the magnetic moment equal to 5.71 B.M. at complexes have magnetic moments in the room temperature, manganese - 5.90 B.M, and normal range typical for octahedral complexes.
1500 3500 5250
[G]
Fig.2 EPR spectra of complexes 1, 2, and 3.
4. CONCLUSION
[Fe(H3L)2*2H2O]*3DMF,[Mn(H3L)2*2H2O]*3 DMF and [Cu(H3L)2*2H2O]*3DMF have been prepared on the basis of N'-maleoyl-salicylic hydrazide and characterized by elemental analysis, FT-IR,magnetic susceptibility and thermal analysis. It found that the ligand
behaves as a monoanionicbidentate where the ligand is in the enol form and coordinates with metal ions through the oxygen atoms of salicylic residue and nitrogen atom bonded with maleic residue.
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N'-MALEOIL-SALISILHIDRAZID ILd Fe(III), Mn(II) Vd Cu(II) KOMPLEKSLdRININ SÎNTEZÎ Vd SPEKTROSKOPIK XUSUSIYYdTLdRI
1 2 2 2 * * G.H. Qondolova, d.d.Macidov, P.O. Fstuttayeva, A.I. Israfilov
'*AMEA Gsncs bolmssi, Ekologiya vs Tsbii Ehtiyyatlar institutu, Azsrbaycan, Gsncs H. dliyev pr-ti, 153, AZ 2003 2AMEA akad. M.F. Nagiyev adina Kataliz vs Qeyri-uzvi Kimya institutu Azsrbaycan, Baki §., H.Cavidpr-ti, 113, AZ 1143, e-mail: gulnargondolova@gmail.com
FeCuHNOhHOhMCHNO) (1), [MnCuHNOhHOhMCHNO) (2) va [Cu(C11H9N2O5)2(H2O)2],3(C3H7NO) (3) komplekslari sintez edilmi§ va element analizi, ÍQ- va EPR spektroskopiya, maqnit hassasligi va termiki analiz vasitalari ila tadqiq edilmi§dir. Bütün komplekslar tahrif edilmi§ oktaedrik qurulu§ amala gatirir. 1, 2 va 3 komplekslarinda metal ionlari iki liqand molekulunun salisil qaliginin oksigen atomu, malein qaligi ila birla§mi§ azot atomu va iki molekul su ila koordinasiya olunur.
Agar sozlw. sintez, Fe(III), Mn (II) va Cu(II) komplekslari, termiki analiz, maqnit hassasligi
СИНТЕЗ И СПЕКТРОСКОПИЧЕСКИЕ ХАРАКТЕРИСТИКИ КОМПЛЕКСОВ Fe(III), Mn(II) И Cu(II) СN'-МАЛЕОИЛ-САЛИЦИЛГИДРАЗИДОМ
1Г.Г. Гондолова, 2А.А. Меджидов, 2П.А. Фатуллаева, 2А.И. Исрафилов
1 Институт Экологии и Природных запасов, Гянджинское отделение НАНА
Азербайджан, AZ 2003 г. Гянджа, пр-т Г.Алиева, 153 2Институт Катализа и Неорганической химии им. акад. М. Ф.Нагиева, НАНА Азербайджан, АZ1143 г. Баку, пр-т Г.Джавида, 113 E-mail: gulnargondolova@,gmail. com
Были синтезированы комплексы Fe(C11H9N2O5)2(H2O)2],3(C3H7NO) (1), [Mn(CnHN2O5)2(H2O)2]'3(C3H7NO) (2) и [Cu(CnHN2O5)2(H2O)2J'3(C3H7NO) (3) и охарактеризованы элементным анализом, ИК- и ЭПР спектрами, магнитной восприимчивостью и термическим анализом. Все комплексы показывают искаженную октаэдрическую геометрию. В комплексах 1,2 и 3 ионы металлов координируются с двумя молекулами лиганда посредством двух атомов кислорода салицилового остатка, двух атомов азота, связанных с малеиновым остатком и двумя молекулами воды. Ключевые слова: синтез, комплексы Fe(III), Mn (II) и Cu(II), магнитная восприимчивость, термический анализ.
Received 12.01.2018.
