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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Hemi- and holo-directed lead(II) complexes in a soft ligand environment
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Hemi- and holo-directed lead(II) complexes in a soft ligand environment

机译:软配体环境中的半定向和全定向铅(II)配合物

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To investigate the geometry and stereochemical activity of the lone pair at the lead atom, lead(II) complexes (1-10) with one tripodal (L-1), one dipodal (L-2) boron-centred soft ligand and eight other small soft heterocyclic ligands, 2-mercaptobenzimidazole (L-3), 2-mercapto-5-methylbenzimidazole (L-4), 3-mercapto-1,2,4-triazole ((LH)-H-5), 3-mercapto-4-methyl-1,2,4-triazole (L-6), 2-mercapto-1,3,4-thiadiazole ((LH)-H-7), 2-mercapto-5-methyl-1,3,4-thiadiazole ((LH)-H-8), 5-mercapto-1-methyltetrazole ((LH)-H-9) and 2-mercapto-4-phenylthiazole ((LH)-H-10) were prepared. The structures of these complexes were elucidated on the basis of X-ray crystallography, elemental analyses as well as H-1 NMR, H-1 DOSY, C-13 NMR and Pb-207 NMR spectroscopy. The coordination numbers of these complexes vary from 4 to 8. The majority of the complexes are polymeric and possess a hemi-directed environment around the lead atoms. Solution studies revealed that most of the complexes are dissociated in highly polar solvents. Most of the complexes are emissive both under ambient conditions and at 77 K in the solid state. However, no obvious relationship between their solid state structures and luminescence behaviour with respect to the nature of the excited state could be identified.
机译:为了研究孤对在铅原子上的几何形状和立体化学活性,研究了铅(II)配合物(1-10)与一个三脚架(L-1),一个双脚架(L-2)以硼为中心的软配体以及其他八个小的软杂环配体,2-巯基苯并咪唑(L-3),2-巯基-5-甲基苯并咪唑(L-4),3-巯基-1,2,4-三唑((LH)-H-5),3-巯基-4-甲基-1,2,4-三唑(L-6),2-巯基1,3,4-噻二唑((LH)-H-7),2-巯基-5-甲基-1,制备了3,4-噻二唑((LH)-H-8),5-巯基-1-甲基四唑((LH)-H-9)和2-巯基-4-苯基噻唑((LH)-H-10) 。在X射线晶体学,元素分析以及H-1 NMR,H-1 DOSY,C-13 NMR和Pb-207 NMR光谱的基础上阐明了这些配合物的结构。这些配合物的配位数为4至8。大多数配合物是聚合物,在铅原子周围具有半定向环境。溶液研究表明,大多数络合物都在高极性溶剂中解离。大多数配合物在环境条件下和固态下在77 K时都是发光的。然而,就激发态的性质而言,没有发现它们的固态结构和发光行为之间的明显关系。

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