Synthesis, characterisation and electronic properties of a series of platinum(ii) poly-ynes containing novel thienyl-pyridine linker groups
作者:Muhammad S. Khan、Muna R. A. Al-Mandhary、Mohammad K. Al-Suti、Neil Feeder、Saifun Nahar、Anna Köhler、Richard H. Friend、Paul J. Wilson、Paul R. Raithby
DOI:10.1039/b201073a
日期:2002.6.7
The synthesis and characterisation of a series of novel poly-yne polymers, trans-[–(PnBu3)2Pt(CC–L–CC)-]n (L
= 2-(2′-thienyl)-pyridine (L1), 2,5-bis(2′-thienyl)pyridine (L2), 6,6′-bis(2″-thienyl)-3,3′-bipyridine (L3)), and the corresponding platinum dimers trans-[(PEt3)2(Ph)Pt(CCLCC)Pt(Ph)(PEt3)2] are described. The dimers were prepared by the reaction of two equivalents of trans-[Pt(PEt3)2(Ph)Cl] with one equivalent of the diterminal diyne HCC–L–CCH, in CuI catalysed dehydrohalogenation reactions in CH2Cl2–Pri2NH, while the polymers are obtained similarly from the diyne and one equivalent of trans-[Pt(PnBu3)2Cl2].
The optical absorption and photoluminescence spectra of the polymers with L1 and L2 linker groups are reported. The optical gaps are 465 nm (2.67 eV) and 486 nm (2.55 eV), respectively. The photoluminescence spectrum for each polymer exhibits one band at room temperature. At 10 K, low-energy emission bands emerge which are attributed to emission from the triplet excited state. The results of these studies are compared with those obtained for other platinum-containing poly-yne and related organometallic polymers.
一系列新型聚炔聚合物反式-[-(PnBu3)2Pt(CC-L-CC)-]n(L = 2-(2′-噻吩基)-吡啶 (L1)、2、5-双(2′-噻吩基)吡啶(L2)、6,6′-双(2″-噻吩基)-3,3′-联吡啶(L3))以及相应的铂二聚体 trans-[(PEt3)2(Ph)Pt(CCLCC)Pt(Ph)(PEt3)2] 进行了描述。二聚体是由两个等量的反式-[Pt(PEt3)2(Ph)Cl]与一个等量的二端二炔 HCC-L-CCH 在 CuI 催化下在 CH2Cl2-Pri2NH 中进行脱氢卤化反应制备的,而聚合物则是由二炔和一个等量的反式-[Pt(PnBu3)2Cl2]以类似方法制备的。 报告了带有 L1 和 L2 连接基团的聚合物的光吸收和光致发光光谱。光隙分别为 465 nm(2.67 eV)和 486 nm(2.55 eV)。在室温下,每种聚合物的光致发光光谱都呈现出一个波段。在 10 K 时,出现了低能发射带,这是由于三重激发态的发射所致。这些研究结果与其他含铂聚炔和相关有机金属聚合物的研究结果进行了比较。