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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Synthesis and photophysics of platinum(II) 6-phenyl-4-(9,9-dihexylfluoren- 2-yl)-2,2′-bipyridine complexes with phenothiazinyl acetylide ligand
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Synthesis and photophysics of platinum(II) 6-phenyl-4-(9,9-dihexylfluoren- 2-yl)-2,2′-bipyridine complexes with phenothiazinyl acetylide ligand

机译：具有吩噻嗪基乙炔基配体的铂（II）6-苯基-4-（9,9-二己基芴-2-基）-2,2'-联吡啶配合物的合成和光物理

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摘要

Two platinum 6-phenyl-4-(9,9-dihexylfluoren-2-yl)-2,2′-bipyridine complexes (4 and 5) with phenothiazinyl acetylide ligand were synthesized and characterized. Their UV-vis absorption and emission characteristics in solution and in Langmuir-Blodgett (LB) film were systematically investigated. The triplet transient difference absorption and nonlinear absorption properties were also studied for these complexes. Both complexes exhibit a broad metal-to-ligand charge transfer/intraligand charge transfer/ligand-to-ligand charge transfer (~1MLCT/~1ILCT/~1LLCT) absorption band between 400 and 500 nm and a ~3MLCT/~3ILCT/~3π,π* emission band at ～594 nm at room temperature, which blue shifts at 77 K. Both UV-vis absorption and emission spectra show negative solvatochromic effect. The triplet excited-state lifetime at room temperature for complex 4 is ～1.2 μs, which is longer than that for complex 5 (～600 ns). The emission quantum yield of complex 4 in toluene is 0.18 and 0.053 for complex 5. Both of the complexes also exhibit broad and moderately strong triplet transient absorption from the near-UV to the near-IR spectral region. However, 5 exhibits stronger reverse-saturable absorption than complex 4 does at 532 nm for nanosecond laser pulses. This is attributed to the weaker ground-state absorption but stronger triplet excited-state absorption at 532 nm for 5 than for 4, which leads to a larger ratio of excited-state absorption cross section to ground-state absorption for 5 than 4. In addition, LB films of 4 and 5 were prepared and characterized by AFM technique. The UV-vis absorption and emission spectra of the LB films of 4 and 5 were also investigated and compared with those obtained in solution.
机译：合成并表征了两个具有苯基噻嗪基乙炔基配体的铂6-苯基-4-（9,9-二己基芴-2-基）-2,2'-联吡啶配合物（4和5）。系统地研究了它们在溶液和Langmuir-Blodgett（LB）膜中的紫外可见吸收和发射特性。还研究了这些配合物的三重态瞬态差异吸收和非线性吸收特性。两种络合物在400至500 nm范围内均具有较宽的金属至配体电荷转移/配体内电荷转移/配体至配体电荷转移（〜1MLCT /〜1ILCT /〜1LLCT）吸收带和〜3MLCT /〜3ILCT /〜室温下约594 nm处的3π，π*发射带，在77 K时蓝移。紫外可见吸收光谱和发射光谱均显示出负溶变色效应。配合物4在室温下的三重态激发态寿命为〜1.2μs，比配合物5（〜600 ns）更长。对于络合物5，络合物4在甲苯中的发射量子产率为0.18和0.053。两种络合物还显示出从近紫外光谱到近红外光谱区域的宽和中等强度的三重态瞬态吸收。然而，对于纳秒激光脉冲，5在532 nm处比络合物4表现出更强的可逆饱和吸收。这归因于5的基态吸收较弱，但532 nm处的三重态激发态吸收却比4较强，这导致5的激发态吸收截面与基态吸收的比大于4。另外，制备了4和5的LB膜并通过AFM技术表征。还研究了4和5 LB薄膜的紫外可见吸收光谱和发射光谱，并将其与溶液中获得的光谱进行了比较。

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