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The first example of linkage isomerism for pyrazole ligands in platinum complexes

机译:铂配合物中吡唑配体的连接异构现象的第一个例子

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The cationic complex [Pt(Me-Pz)4](Cl)2 (1~(2+) · (Cl)2) has been prepared by the reaction of [PtCl2(Me-Pz)2] with an excess of 3(5)-methylpyrazole (3(5)-Me-Pz) and it was characterized by elemental analyses (C, H, N), ESI~+-MS, IR, ~1H and ~(13)C NMR spectroscopies. Linkage isomerism of the coordinated pyrazole was observed in a solution for 1~(2+) · (Cl)2 with an overall 3:4 ratio for 3-Me-Pz and 5-Me-Pz metal-bound species, respectively. X-ray diffraction studies of two complexes, 1~(2+) · [PtCl4] and 1~(2+) · (pic)2, allows the observation of different coordination modes of the 3(5)-Me-Pz ligand in the solid state, i.e. three coordinated 5-Me-Pz and one 3-Me-Pz in 1~(2+) · [PtCl4] and three coordinated 3-Me-Pz and one 5-Me-Pz in 1~(2+)·(pic)2.
机译:通过[PtCl2(Me-Pz)2]与过量3的反应制备了阳离子络合物[Pt(Me-Pz)4](Cl)2(1〜(2+)·(Cl)2) (5)-甲基吡唑(3(5)-Me-Pz),通过元素分析(C,H,N),ESI〜+ -MS,IR,〜1H和〜(13)C NMR光谱进行表征。在1〜(2+)·(Cl)2的溶液中观察到配位吡唑的键链异构现象,其中3-Me-Pz和5-Me-Pz金属键合物质的总比例分别为3:4。两种配合物1〜(2+)·[PtCl4]和1〜(2+)·(pic)2的X射线衍射研究可以观察到3(5)-Me-Pz配体的不同配位模式固态,即1〜(2+)中的3个配位的5-Me-Pz和1个3-Me-Pz·[PtCl4]和1〜(3个中的配位为3个配位的3-Me-Pz和1个5-Me-Pz 2+)·(图)2。

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