Crystal structures and NQR spectra of molecular adducts (Et/Ph)(2)SnI2L2(L=(CH3)(2)SO and [(CH3)(2)N](3)PO) exhibiting large I-127 asymmetry parametersстатья
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Аннотация:A notable increase in the electric field gradient asymmetry parameter was observed at the (127)/sites in adducts R2SnI2L2 when R is replaced by Et or Ph. This increase accompanied the expected elongation of Sn-I bonds cis to Et/Ph, hence evidencing a disturbance of the iodine valence p(pi)-orbitals upon the substitution. With the aim to understand the reason for this disturbance, we correlated the (127)/NQR and X-ray diffraction data for the title compounds. The results showed that secondary iodine-sulfur contacts may account for large eta-values observed for Et2SnI2(DMSO)(2), whereas in the remaining compounds, the increased asymmetry parameters seem to be caused by an interaction of the iodine pi-system with that of the phenyl (pyridine) rings.