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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Molecular rectangles from platinum(ii) and bridging dicarbene, diisocyanide and 4,4′-bipyridine ligands
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Molecular rectangles from platinum(ii) and bridging dicarbene, diisocyanide and 4,4′-bipyridine ligands

机译:铂(ii)和桥接二碳烯,二异氰化物和4,4'-联吡啶配体的分子矩形

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A series of benzobisimidazolium salts have been prepared and treated with [PtCl_2(dppe)] or [PtCl_2(dmpe)] in the presence of sodium acetate to yield dinuclear dicarbene-bridged complexes of the type [(P^P)(X)Pt(benzodicarbene)Pt(X)(P^P)](X)_2 [5]Br_2-[11] I_2. The reaction of compounds [7]Br_2 and [11]I_2 with AgPF_6 in acetonitrile led to the exchange of the metal-bound bromo or iodo ligands for acetonitrile and the formation of complexes [(dmpe)(MeCN)Pt(benzodicarbene)Pt(MeCN)(dmpe)](PF_6)_4 [12](PF_6)_4 and [13](PF_6)_4. The dinuclear complex [13](PF_6)_4 reacts with 4,4′-bipyridine (4,4′-bipy) to give the molecular rectangle [15](PF_6)_8 featuring two bridging dicarbene and two bridging 4,4′-bipy ligands. Complex [13](PF_6)_4 also reacts with β,β′-bis(triisopropylsiloxy)phenyl-1,4-diisocyanide 16 followed by hydrolysis of the Si-O bonds and intramolecular carbene formation to yield the molecular square [18](BF_4)_8 featuring bridging NR,NR- and NH,O-substituted dicarbene ligands. Reaction of the dinuclear complex [12](PF_6)_4 containing a sterically demanding N,N′,N′′,N′′′-substituted dicarbene ligand under otherwise identical reaction conditions did not lead to any molecular rectangles. The molecular square [19](BF_4)_8 was synthesized from β,β′-bis(triisopropylsiloxy)phenyl-1,4- diisocyanide 16 and [PtCl_2(dmpe)] in the presence of AgBF_4. It reacts to yield the molecular square [20](BF4) 8 with four NH,O-substituted dicarbene ligands by Si-O bond cleavage and subsequent intramolecular cyclization.
机译:制备了一系列苯并双咪唑鎓盐,并在乙酸钠存在下用[PtCl_2(dppe)]或[PtCl_2(dmpe)]处理,得到[(P ^ P)(X)Pt类型的双核双碳烯桥连络合物(苯并二碳烯)Pt(X)(P ^ P)](X)_2 [5] Br_2- [11] I_2。化合物[7] Br_2和[11] I_2与AgPF_6在乙腈中的反应导致金属结合的溴或碘配体交换为乙腈,并形成配合物[(dmpe)(MeCN)Pt(苯并二碳烯)Pt( MeCN)(dmpe)](PF_6)_4 [12](PF_6)_4和[13](PF_6)_4。双核络合物[13](PF_6)_4与4,4'-联吡啶(4,4'-bipy)反应,得到分子矩形[15](PF_6)_8,其特征在于两个桥联二碳烯和两个桥联4,4'- bipy配体。配合物[13](PF_6)_4也与β,β'-双(三异丙基甲硅烷氧基)苯基-1,4-二异氰化物16反应,然后水解Si-O键和形成分子内卡宾,以产生分子正方形[18]( BF_4)_8的特征是桥接NR,NR-和NH,O取代的二碳烯配体。含有空间上需要的N,N′,N′′,N′′′-取代的二碳烯配体的双核络合物[12](PF_6)_4在其他相同的反应条件下的反应没有产生任何分子矩形。在AgBF_4存在下,由β,β'-双(三异丙基甲硅烷氧基)苯基-1,4-二异氰化物16和[PtCl_2(dmpe)]合成了[19](BF_4)_8分子。它通过Si-O键裂解和随后的分子内环化反应生成具有四个NH,O-取代的二碳烯配体的分子正方形[20](BF4)8。

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