Abstract
New divalent Co, Ni, Zn and Cd pyrazinecarboxylate hydrazinates of the formulae M(pyzCOO)2·nN2H4·xH2O and Mpyz(COO)2·N2H4·xH2O obtained by the reaction of respective metal nitrate hydrates with 2-pyrazinecarboxylic (HpyzCOO)/2,3-pyrazinedicarboxylic (H2pyz(COO)2) acid and hydrazine hydrate have been characterized on the basis of analytical, spectroscopic (electronic and infrared), thermal and X-ray powder diffraction studies. The electronic spectroscopic data suggest that the cobalt and nickel complexes are of spin-free (high-spin) type with octahedral geometry. The IR absorption bands of N-N stretching in the range 980-972 cm-1 unambiguously prove the bidentate bridging nature of the N2H4 ligand. The hydrazinate complexes of 2,3-pyrazinedicarboxylate lose hydrazine molecule exothermally, whereas 2-pyrazinecarboxylate compounds lose the same endothermally. Further, all the complexes undergo endothermic (dehydration and/or dehydrazination) followed by exothermic decomposition except the Zn and Cd complexes of 2,3-pyrazinedicarboxylate, which show only exothermic decomposition. In order to know the isomorphic nature among the complexes, the X-ray powder patterns have been compared.
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T. Premkumar and S. Govindarajan, Thermochim. Acta, 386 (2002) 35.
T. Premkumar, S. Govindarajan, W.-P. Pan and R. Xie, J. Therm. Anal. Cal., 74 (2003) 1357.
J. R. Allan, A. D. Paton, K. Turvey, H. J. Bowley and D. L. Gerrard, Inorg. Chim. Acta, 132 1987) 4.
C. L. Klein, R. J. Majeste, L. M. Trefonas and C. J. O’Conner, Inorg. Chem., 21 (1982) 1891.
H. Ptasiewicz-Bak, A. Ostrowski and J. Leciejewicz, Polish J. Chem., 72 (1998) 2014.
N. W. Alcock, T. J. Kemp, S. M. Roe and J. Leciejewicz, Inorg. Chim. Acta, 248 (1996) 241.
M. Wenkin, M. Devillers, B. Tinant and J. P. Declereq, Inorg. Chim. Acta, 258 (1997) 113.
A. Neels, H. S. Evans, Y. Wang, A. Clearfield and D. M. Poojary, Inorg. Chem., 36 (1997) 5406.
C. J. O’Connor, C. L. Klein, R. J. Majeste and L. M. Trefonas, Inorg. Chem., 21 (1982) 64.
P. Richard, D. Tran Qui and E. F. Bertaut, Acta Crystallogr., Sect. B, 30 (1974) 628.
K. C. Patil, D. Gajapathy and K. Kishore, Thermochim. Acta, 52 (1982) 113.
D. Gajapathy, S. Govindarajan, K. C. Patil and H. Manohar, Polyhedron, 2 (1983) 865.
B. N. Sivasankar and S. Govindarajan, J. Thermal Anal., 48 (1997) 1401.
S. Yasodhai and S. Govindarajan, Synth. React. Inorg. Met.-Org. Chem., 29 (1999) 919.
J. R. Allan, A. D. Paton, K. Turvey, H. J. Bowley and D. L. Gerrard, Thermochim. Acta, 124 (1988) 345.
I. Vogel, A Text Book of Quantitative Inorganic Analysis, 4th Ed., Longman, London 1986.
S. Govindarajan, K. C. Patil, H. Manohar and P. E. Werner, J. Chem. Soc. Dalton Trans., (1986) 119.
A. B. P. Lever, Inorganic Electronic Spectroscopy, 2nd Ed., Elsevier, Amsterdam 1984.
A. Braibanti, F. Dallavalle, M. A. Pellinghelli and E. Laporati, Inorg. Chem., 7 (1968) 1430.
S. Yasodhai and S. Govindarajan, J. Therm. Anal. Cal., 67 (2002) 679.
R. C. Lord, A. L. Martson and F. A. Miller, Spectrochim. Acta, 9 (1957) 113.
J. R. Allan, N. D. Baird and A. L. Kassyk, J. Thermal Anal., 16 (1979) 79.
R. C. Paul and S. L. Chadha, J. Inorg. Nucl. Chem., 31 (1969) 2753.
S. Yasodhai and S. Govindarajan, Synth. React. Inorg. Met.-Org. Chem., 30 (2000) 745.
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Premkumar, T., Govindarajan, S. Transition metal complexes of pyrazinecarboxylic acids with neutral hydrazine as a ligand. J Therm Anal Calorim 79, 115–121 (2005). https://doi.org/10.1007/s10973-004-0571-8
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DOI: https://doi.org/10.1007/s10973-004-0571-8