Add time:08/16/2019         Source:sciencedirect.com

The synthesis of four new di-n-butyl[bis{dimethyl-2-(3-oxo-5-phenyl(4-subtituted)penten-5-ato)malonates}]tin(IV) 2a–2d is reported. These complexes have been characterized by 1H, 13C, 119Sn NMR, HMQC, HMBC, infrared spectroscopy and mass spectrometry (FAB). Their structures in CDCl3 solution show a distorted octahedral geometry with a trans disposition of the n-butyl substituents. The 119Sn NMR study at low variable-temperature indicates the presence of trans anti- and syn-isomers, and solid-state 13C and 119Sn NMR spectra of compound 2d give also evidence of the mixture of trans isomers. The X-ray diffraction study of compound 2d at 168 K shows only the trans syn-isomer, where the metal is six-coordinated in a skewed trapezoidal bipyramidal (STB) geometry.

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