81540-35-4Relevant academic research and scientific papers
9,10-Bis(4,5-diphenylimidazol-2-yliden)-9,10-dihydroanthracene - A folded p-quinodimethane
Gompper, Rudolf,Mehrer, Mathias,Polborn, Kurt
, p. 6379 - 6382 (1993)
Dehydrogenation of 9,10-bis(4,5-diphenyl)-imidazol-2-yl)-anthracene furnishes the title compound. 1,4-Bis- [4,5-bis(p-methoxyphenyl-imidazol-2-ylidene)]-1,4-cyclohexadiene doesn't show any thermochromism.
Impact of Heterocycle Annulation on NIR Absorbance in Quinoid Thioacene Derivatives
Hou, Peng,Peschtrich, Sebastian,Huber, Nils,Feuerstein, Wolfram,Bihlmeier, Angela,Krummenacher, Ivo,Schoch, Roland,Klopper, Wim,Breher, Frank,Paradies, Jan
, (2022/04/07)
The synthesis and characterisation of a homologous series of quinoid sulfur-containing imidazolyl-substituted heteroacenes is described. The optoelectronic and magnetic properties were investigated by UV/vis, fluorescence and EPR spectroscopy as well as quantum-chemical calculations, and were compared to those of the corresponding benzo congener. The room-temperature and atmospherically stable quinoids display strong absorption in the NIR region between 678 and 819 nm. The dithieno[3,2-b:2′,3′-d]thiophene and the thieno[2′,3′:4,5]thieno[3,2-b]thieno[2,3-d]thiophene derivatives were EPR active at room temperature. For the latter, variable-temperature EPR spectroscopy revealed the presence of a thermally accessible triplet state, with a singlet-triplet separation of 14.1 kJ mol?1.
