Laura L. Wright

Sterically constraining photoluminescence. X-ray crystal structure of a bulky platinum(II) α-diimine complex

The photoluminescence study of a series of platinum(II) α -diimine complexes revealed a dramatic decrease in steady-state phosphorescence intensity when the diimine ligand was substituted in the 2 and 9 positions. Therefore, the molecular structure of the complex Pt(2,9-dmp)(mes)2 (where mes = 2,4,6-trimethylphenyl, and 2,9-dmp = 2,9-dimethyl-1,10-phenanthroline) was determined by X-ray diffraction methods: monoclinic, space group P21/N, a = 7.9335(7), b = 21.952(3), c = 15.3103(3) Å, β = 93.4980(5), Z = 4, R = 0.070, Rw = 0.045. The complex has significant distortions from the ideal square planar geometry which may be responsible for the lack of detectable phosphorescence as compared with those complexes lacking substituents in the 2 and 9 positions on the diimine ligand.