New organotin(IV) complexes of nicotinamide, isonicotinamide and some of their novel phosphoric triamide derivatives: Syntheses, spectroscopic study and crystal structures |
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| Authors: | Khodayar Gholivand Nasrin Oroujzadeh |
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| Institution: | a Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
b Azad University, Garmsar Branch, Garmsar, Iran |
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| Abstract: | Three novel phosphoramidate ligands with formula  , R = Nicotinamide(nia), R′ = NHC(CH3)3(L1), NH(C6H11) (L2); R = isonicotinamide(iso), NH(C6H11) (L3) and their new organotin(IV) complexes with formula SnCl2(CH3)2(X)2, X = L1 (C1), L2 (C2), L3 (C3) plus SnCl2(CH3)2(L4)2(C4), L4 = isoP(O)NHC(CH3)3]2, were synthesized and characterized by 1H, 13C, 31P,119Sn NMR, IR, UV-Vis spectroscopy and elemental analysis. Two novel complexes of nia and iso with formula SnCl2(CH3)2(X)2, X = nia (C5), iso (C6) were also prepared and all the complexes were spectroscopically studied in comparison to their related ligands and to each other. The crystal structure of complexes C1, C3, C4, and C5 were determined by X-ray crystallography. -Sn-Cl···H-N- major hydrogen bonds beside other electrostatic interactions produced a three dimensional polymeric cluster in the crystalline lattice of C1, C3, C5 and a two dimensional polymeric chain in C4. Results showed that coordination of the phosphoramidate ligand (L4) to Sn in C4 has been occurred from the nitrogen site of the pyridine ring similar to C5,C6 in which there is no P O donor site; however, in C1 and C3 the active donor site of corresponding ligands is PO. It seems that in these complexes there is a competition between PO and Npyridine donor sites and the influential factor which determines the winner site is the type of substituents on phosphorus atom. |
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| Keywords: | Organotin(IV) Phosphoramidate Nicotinamide Isonicotinamide NMR spectroscopy X-ray crystallography |
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