Solid-state temperature-dependent luminescence of <i>C</i>,<i>C</i>′-diaryl-<i>o</i>-carboranes based on restriction of excited-state structural relaxation
Kazuhiro Yuhara, Kazuo Tanaka
Abstract
-carborane as a prototypical compound and synthesized derivatives with electronically different substituents on aryl units. Based on extensive analyses with crystallography, variable temperature optical measurements and theoretical calculation, we show that luminochromic behaviors can be explained by partially restricted excited-state elongation of the carbon-carbon bond in the cluster. Our results indicate that thermal expansion and contraction of the crystalline lattice should play a key role in modulating the degree of excited-state structural relaxation including the bond elongation in the cluster.
Topics & Concepts
ThermochromismExcited stateLuminescenceRelaxation (psychology)Solid-stateCrystallographyChemistryCrystal (programming language)Materials sciencePhysical chemistryAtomic physicsPhysicsOptoelectronicsOrganic chemistryComputer scienceProgramming languageSocial psychologyPsychologyLuminescence and Fluorescent MaterialsBoron Compounds in ChemistryNanoplatforms for cancer theranostics