Authors: WaiYeung Wong SukYue Poon JianXin Shi KokWai Cheah
Publish Date: 2007/01/09
Volume: 17, Issue: 1, Pages: 189-200
Abstract
A series of lightemitting group 14 elementcontaining organometallic platinum polyynes of the form trans–PtPBu32C≡ CArC≡ CER2C≡ CArC≡ C– n Ar = 9butylcarbazole36diyl ER2 = SiMe2 SiPh2 GeMe2 GePh2 were synthesized and spectroscopically characterized The solution properties and regiochemical structures of this new structural class of organosilicon and organogermaniumbased metallopolyynes were studied by IR and NMR 1H 13C 29Si and 31P spectroscopies The optical absorption and photoluminescence spectra of these metallopolymers were examined and compared with their welldefined dinuclear model complexes transPtPhPEt32C≡ CArC≡ CER2C≡ CArC≡ CPtPhPEt32 The influence of the heavy platinum atom and the group 14 silyl or germyl structural unit possessing different side group substituents on the thermal and phosphorescence properties were investigated in detail We have also established the goal for studying the evolution of the lowest singlet and triplet excited states with the nature of ER2 unit in these metallopolymers The present work indicates that the phosphorescence emission efficiency harnessed through the heavyatom effect of platinum in the main chain changes significantly with the identity of ER2 in the general orders GeR2 SiR2 R = Me Ph and EMe2 EPh2 E = Si Ge
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