Bismuth as a versatile cation for luminescence in coordination polymers from BiX 3 /4,4'-bipy: understanding of photophysics by quantum chemical calculations and structural parallels to lanthanides

• Published in: Dalton transactions : an international journal of inorganic chemistry 2018-06, Vol.47 (23), p.7669-7681
• Main Authors: Sorg, Jens R, Wehner, Tobias, Matthes, Philipp R, Sure, Rebecca, Grimme, Stefan, Heine, Johanna, Müller-Buschbaum, Klaus
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/C8DT00642C

Coordination polymers (CPs) with bismuth(iii) as a connectivity centre have been prepared from BiX3 (X = Cl-I) and 4,4'-bipyridine (bipy) in order to implement Bi-based luminescence. The products were obtained via different synthetic routes such as solution chemistry, melt syntheses or mechanochemical reactions. Five neutral and anionic 1D-CPs are presented that show a chemical parallel to trivalent lanthanides forming isostructural or closely related 1D-CPs, of which five additional compounds are described. Bi3+ proves to be a versatile cation for luminescence resulting from energy transfer processes between a metal and a ligand in the presented CPs. Quantum chemical calculations were carried out to investigate Bi3+-participation in the luminescence processes. The calculated results allow an assignment of the bright transitions composed of mainly metal-to-ligand-charge transfer (MLCT) character. These results show that Bi3+ can form strongly luminescent coordination compounds with N-donor ligands.