Add time:09/28/2019         Source:infona.pl

A series of platinum complexes, [Pt(7,8-bzq)(dppm)](PF 6 ), [Pt(7,8-bzq)(dppe)](PF 6 ) and [Pt(7,8-bzq)(dppp)](PF 6 ), which vary only in the number of carbon atoms bridging two diphenyl phosphine ligands, have been synthesized and their structures have been determined by single crystal X-ray crystallography. Structural characteristics are as follows: [Pt(7,8-bzq)(dppm)](PF 6 ), orthorhombic, Pbca, a = 17.427(4), b = 17.946(4), c = 22.262 9, Z = 8; [Pt(7,8-bzq)(dppe)](PF 6 ), monoclinic, P2 1 /c, a = 11.519(2), b = 14.080(3), c = 21.804(4) 9, Z = 4; [Pt(7,8-bzq)(dppp)](PF 6 ), Pna2 1 , a= 20.216(4), b = 11.574(2), c = 15.739(3) 9, Z = 4. The P-Pt-P bite angle varies in the series from 72.1(5) to 84.5(2) to 91.57(10)° for [Pt(7,8-bzq)(dppm)] + , [Pt(7,8-bzq)(dppe)] + and [Pt(7,8-bzq)(dppp)] + , respectively. The absorption spectra are blue-shifted and the emission lifetimes at 77 K increase in the same order. Emission lifetime differences are shown to relate to the perturbation associated with the additional methylene groups.

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