C(sp 3)H⋯O and C(sp 2)H⋯O hydrogen bonds in acyclic- and cyclic-organotellurium carboxylates

Abstract

The reactions between R 2TeI 2 (R 2=(CH 3) 2, C 4H 8, C 5H 10) and AgOCOR′ (R′=C 6H 5, 4-NO 2C 6H 4, CHCHC 6H 5) (molar ratio 1:2) yield diorganotellurium dicarboxylates: (CH 3) 2Te(OCOC 6H 5) 2 ( 1), C 5H 10 Te(OCOC 6H 5) 2 ( 2), C 4H 8Te(OCO4-NO 2C 6H 4) 2 ( 3) and C 4H 8Te(OCOCHCHC 6H 5) 2 ( 4). They are characterized by IR, ( 1H, 13C, 125Te) solution NMR; ( 13C, 125Te) solid state NMR spectroscopy. The X-ray structures of 1– 4 (the immediate environment about tellurium is that of distorted trigonal bipyramidal geometry with a stereochemically active electron lone pair) are described in the context of their ability to generate intermolecular CH⋯O hydrogen bonds, which lead to the formation of supramolecular assemblies.