Blue Phosphorescent -N-Heterocyclic Carbene Platinum Acetylides: Dependence on Energy Gap and Conformation.

A series of 11 complexes of the type -(NHC)Pt(CC-Ar) (where NHC = N-heterocyclic carbene) have been synthesized and their photophysics characterized. The complexes display moderately efficient deep blue to green phosphorescence from a triplet excited state that is localized mainly in the aryl acetylide ligand (CC-Ar). The emission energy varies with the substituent on CC-Ar, with the highest energy emission for Ar = 4-pyridyl.

Suzuki-Miyaura coupling of arylboronic acids to gold(iii).

Gold(iii) is prominent in catalysis, but its organometallic chemistry continues to be restricted by synthesis. Metal-carbon bond formation often relies on organometallic complexes of electropositive elements, including lithium and magnesium. The redox potential of gold(iii) interferes with reactions of these classic reagents.