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Synthesis and characterization of nicotinamide coordinated metal carbonyl complexes
S. Vancheesan
Published in
2002
Volume: 41
   
Issue: 11
Pages: 2260 - 2267
Abstract
Three new nicotinamide coordinated group VI B metal carbonyl complexes fac-[M(CO)3(nicotinamide)3] (M = Cr, Mo, and W; 4, 5, and 6) (nicotinamide = 3-H2NOCC5H4N) have been synthesized. Reaction of the 'in situ' generated complex precursors fac-[M(CO)3(CH3CN)3] (M = Cr, Mo, and W: 1, 2, and 3) with three equivalents of nicotinamide in methanol at room temperature give nicotinamide coordinated metal carbonyl complexes 4, 5, and 6 in good yields. The complexes exhibit two bands corresponding to v(C≡O) of metal carbonyl groups and v(C=O) of nicotinamide ligands. All the complexes exhibit a very strong stretching band corresponding to v(C=O) of coordinated nicotinamide ligands at 1684 (Cr, 4); 1669 (Mo, 5); and 1683 cm.1 (W, 6). The occurrence of single v(C=O) band suggests the coordination of three nicotinamide molecules that are arranged cis to each other and representing a C3v configuration of ligands around the metal atom in the facial geometry of the complexes. The 1H NMR spectra of the complexes shows signals at four different chemical shift regions, corresponding to the four protons on the pyridine ring of the nicotinamide ligand. The calculated integral value of each signal is present in the ratio 1:1:2:2. The powder X-ray diffractogram of the complexes exhibit similar pattern suggesting the similar arrangements of atoms in the crystal lattice and geometry.
About the journal
JournalIndian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
ISSN03764710
Open AccessNo
Concepts (19)
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    Carbonyl derivative
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    Ligand
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    Metal complex
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    Methanol
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    Nicotinamide
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    Proton
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    Pyridine
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    Article
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    Atom
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    Chemical bond
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    Chemical reaction
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    Crystal structure
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    Geometry
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    Infrared spectroscopy
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    Molecule
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    Proton nuclear magnetic resonance
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    Room temperature
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    Synthesis
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    X ray diffraction