Labilizing the Photoinert: Extraordinarily Facile Photochemical Ligand Ejection in an [Os(N perpendicular ) sub(3)] super(2+) Complex

Whilst [Os(N perpendicular ) sub(3)] super(2+) complexes are supposed to be photochemically inert to ligand loss, the complex [Os(btz) sub(3)] super(2+) (btz=1,1'-dibenzyl-4,4'-bi-1,2,3-triazolyl) undergoes unprecedented photolytic reactivity to liberate free btz ( Phi sub(363) approximately 1.2%). Further, both cis and trans isomers of the photodechelated ligand-loss solvento intermediate [Os( Kappa super(2)-btz) sub(2)( Kappa super(1)-btz)(NCMe)] super(2+) are unambiguously observed and characterized by NMR spectroscopy and mass spectrometry.Original Abstract: Ungewohnliches Verhalten: Eine ausergewohnliche photochemische Ligandabspaltung des Komplexes [Os(btz) sub(3)] super(2+) tritt in einem Donorlosungsmittel auf. Die cis- und trans-Isomere der Zwischenstufe [Os([kappa] super(2)-btz) sub(2)([kappa] super(1)-btz)(NCMe)] super(2+) wurden beobachtet und charakterisiert (siehe Bild; btz=1,1'-Dibenzyl-4,4'-bi-1,2,3-triazolyl).