A red-emitting light switch based on a heteroleptic ruthenium(II) complex containing a tridentate dppz analogue.
Delocalization of the charge-transfer excitation in the series [Ru(NNN)(bpy)CN](+) [bpy = 2,2'-bipyridine; 1, NNN = 2,2':6',2''-terpyridine; 2, NNN = 2-(2'-pyridyl)-1,10-phenanthroline or php; 3, NNN = 6'-(2''-pyridyl)dipyrido[3,2-a:2',3'-c]phenazine or dppzp] proves to be an effective way of tuning photophysical properties. Red-emitting 3 functions as a DNA "light switch", shows emission from a state with charge-transfer-to-phenazine character, and exhibits a significantly enhanced emission signal relative to 1 and other dppzp-containing ruthenium(II) complexes.
Stewart
David J
DJ
Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907-2084, USA.
Fanwick
Phillip E
PE
McMillin
David R
DR
D003116:Color; D004247:DNA / Q000737:chemistry; D008027:Light; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D009942:Organometallic Compounds / Q000737:chemistry*; D010619:Phenazines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
D049408:Luminescent Agents; D009942:Organometallic Compounds; D010619:Phenazines; C443808:dipyrido(3,2-a-2',3'-c)phenazine; D012428:Ruthenium; D004247:DNA