Synthesis and characterization of platinum(ii) di-ynes and poly-ynes incorporating ethylenedioxythiophene (EDOT) spacers in the backbone
作者:Muhammad S. Khan、Mohammed K. Al-Suti、Hakkikulla H. Shah、Said Al-Humaimi、Fathiya R. Al-Battashi、Jens K. Bjernemose、Louise Male、Paul R. Raithby、Ning Zhang、Anna Köhler、John E. Warren
DOI:10.1039/c1dt11010a
日期:——
A series of trimethylsilyl-protected di-alkynes incorporating 3,4-ethylenedioxythiophene (EDOT) linker groups Me3Si–CC–R–CC–SiMe3 (R = ethylenedioxythiophene-3,4-diyl 1a, 2,2′-bis-3,4-ethylenedioxythiophene-5,5′-diyl 2a, 2,2′,5′,2′′-ter-3,4-ethylenedioxythiophene-5,5′′-diyl 3a) and the corresponding terminal di-alkynes, H–CC–R–CC–H 1b–2b has been synthesized and characterized and the single crystal X-ray structure of 1a has been determined. CuI-catalyzed dehydrohalogenation reaction between trans-[(Ph)(Et3P)2PtCl] and the terminal di-alkynes 1b–2b in iPr2NH/CH2Cl2 (2 : 1 mole ratio) gives the Pt(II) di-ynes trans-[(Et3P)2(Ph)Pt–CC–R–CC–Pt(Ph)(Et3P)2] 1M–2M while the dehydrohalogenation polycondensation reaction between trans-[(nBu3P)2PtCl2] and 1b–2b (1 : 1 mole ratio) under similar reaction conditions affords the Pt(II) poly-ynes trans-[Pt(PnBu3)2–CC–R–CC-]n1P–2P. The di-ynes and poly-ynes have been characterized spectroscopically and, for 1M and 2M, by single-crystal X-ray which confirms the “rigid rod” di-yne backbone. The materials possess excellent thermal stability, are soluble in common organic solvents and readily cast into thin films. Optical absorption spectroscopic measurements reveal that the EDOT spacers create stronger donor-acceptor interactions between the platinum(II) centres and conjugated ligands along the rigid backbone of the organometallic polymers compared to the related non-fused and fused oligothiophene spacers.
一系列含有 3,4-亚乙二氧基噻吩(EDOT)连接基团 Me3Si-CC-R-CC-SiMe3 (R = 亚乙二氧基噻吩-3,4-二基 1a、2,2′-双-3,4-亚乙二氧基噻吩-5,5′-二基 2a、2,2′、5′,2′′-叔-3,4-亚乙二氧基噻吩-5,5′′-二基 3a)和相应的端二炔烃 H-CC-R-CC-H 1b-2b 的合成和表征,并测定了 1a 的单晶 X 射线结构。在 CuI 催化下,反式-[(Ph)(Et3P)2PtCl] 与端二炔烃 1b-2b 在 iPr2NH/CH2Cl2 (2 : 在类似的反应条件下,反式-[(nBu3P)2PtCl2]和 1b-2b(1 : 1 摩尔比)发生脱氢卤化缩聚反应,得到反式-[(Et3P)2(Ph)Pt-CC-R-CC-Pt(Ph)(Et3P)2]1M-2M 的铂(II)二炔。这些二炔和多炔的光谱特性,以及 1M 和 2M 的单晶 X 射线特性,都证实了 "刚性棒状 "二炔骨架。这些材料具有出色的热稳定性,可溶于常见的有机溶剂,并很容易铸成薄膜。光学吸收光谱测量结果表明,与相关的非熔合和熔合低聚噻吩间隔物相比,EDOT 间隔物在铂(II)中心和有机金属聚合物刚性骨架上的共轭配体之间产生了更强的供体-受体相互作用。