Smita Basu, G. Gupta, Babulal Das
Aug 15, 2010
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0
Influential Citations
30
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Journal
Journal of Organometallic Chemistry
Abstract
The one pot reactions carried among ortho -aminophenol, R 2 SnO (R = Me or Ph) and acetyl acetone, 2-hydroxyacetophenone and 2-hydroxy-3-methylacetophenone led to six new diorganotin(IV) compounds Me 2 SnL1 ( 1 ), Ph 2 SnL1 ( 2 ), Me 2 SnL2 ( 3 ) Ph 2 SnL2 ( 4 ), Me 2 SnL3 ( 5 ) and Ph 2 SnL3 ( 6 ) ( H2L1 = 2-(3-hydroxy-1-methyl-but-2-enylideneamino)-phenol, H2L2 and H2L3 = 2-[1-(2-hydroxyaryl)alkylideneamino]-phenol) in good yields. Combination of IR, 1 H, 13 C and 119 Sn NMR and X-ray diffraction techniques along with elemental analyses evidenced the formation of penta-coordinated monomeric species. The crystal structures of ligand H2L1 and complexes 1 , 3 and 4 were determined by single crystal X-ray diffraction study. In the solid state, the ligand H2L1 exists as keto-enamine tautomeric form. There are N–H…O intra-molecular hydrogen bonds between amine and carbonyl groups. Diorganotin(IV) complexes 1 , 3 and 4 are monomers with TBP (trigonal bipyramidal) geometry surrounding the tin atom. The O , N , O - tridentate ligand places its two oxygen donating atoms in the axial positions, and the nitrogen atom occupies one equatorial position. The two R groups attached to tin occupy the other two equatorial positions. The solution structures were predicted by 119 Sn NMR spectroscopy.