Abstract
Abstract The intramolecularly coordinated 8-methoxytellurium compounds (8-MeOC 10 H 6 ) 2 Te 2 ( 3 ), 8-MeOC 10 H 6 TeCl 3 ( 7a ), 8-MeOC 10 H 6 TeBr 3 ( 7b ) and 5-Br-8-MeOC 10 H 6 TeBr 3 ( 7c ) were prepared and fully characterized by multinuclear NMR spectroscopy, MS spectrometry and X-ray crystallography. The intramolecular Te–O coordination of 7a and the related 6-diphenylphosphinoxy-acenaphtyl-5-tellurium trichloride ( 6a ) as well as the related Te–N coordination of the 8-(dimethylamino)-naphthyltellurium trichloride ( 5a ) were analyzed using a set of real-space bond indicators derived from DFT calculations and the electron density-based theories AIM, ELI-D and NCI. Similar electronic parameters were obtained for the weak Te–N and Te–O interactions in 5a and 7a , which are governed by σ-hole bonding. Additional electrostatic interactions between the terminal O atom and the Te atom in 6a result in a significantly shorter and stronger Te–O contact compared to that in 7a . This, in turn, leads to an elongation of the Te–Cl bond opposite to the Te–O bond.
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