Synthesis and crystal structure of tetrakis(2,4,6-trimethylphenyl)dibismuthoxide

Add time:07/11/2019    Source:sciencedirect.com

Bis(2,4,6-trimethylphenyl)chlorobismuth (1), synthesized by comproportionation reaction of tris(2,4,6-trimethylphenyl)bismuth and bismuth chloride, was reduced with sodium in liquid ammonia. By subsequent insertion of oxygen into the Bi–Bi bond of the intermediate dimer tetrakis(2,4,6,-trimethylphenyl)dibismuth the title compound (2) was formed whose crystal structure has been determined: [monoclinic, space group P21/n; a=12.225(1) Å; b=14.957(1) Å; c=18.531(1) Å; β=97.76(1)°; Z=4]. (2) shows a Bi–O–Bi bond angle of 124.6° and a short intramolecular nonbonding Bi⋯Bi distance of 3.665 Å, probably the inherent reason for the metallic colour of (2).

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