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Structural Studies of Two Isoelectronic Tetrakis Isocyano Complexes

机译:两种等电子四烷基异氰基配合物的结构研究

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Two isoelectronic tetrakis isocyano compounds, tetra(p-isocyanoanisole)nickel(0) and tetra(p-isocyanoanisole)copper(I) hexafluorophosphate were synthesized from nickel bis cyclooctadiene and copper (I) tetra acetonitrile hexafluorophosphate and the isonitrile, respectively, and their structures were determined. The nickel complex crystallizes in the orthorhombic space group P2(1)2(1)2(1) with a = 9.6709(8), b = 15.2324(13), c = 19.0955(16) angstrom and Z = 4. The copper salt forms crystals with a tetragonal setting in P4 with a = b = 15.8206(5), c = 6.5848(4) angstrom and Z = 2. Both complexes exhibit the approximate tetrahedral coordination environment expected for 18 valence electron complexes with soft sigma-donor pi-acceptor ligands. Packing in the nickel complex is dominated by weak pi-pi stacking, C-H center dot center dot center dot pi(phenyl), and C-H center dot center dot center dot pi interactions towards the isonitrile carbon and nitrogen atoms, and several slightly stronger C-H center dot center dot center dot O interactions. In the copper complex the presence of the PF6 anion allows for the formation of stronger C-H center dot center dot center dot F interactions, and these in combination with pi-pi stacking and C-H center dot center dot center dot O hydrogen bonds dominate the packing.
机译:分别由双环辛二烯镍和铜(I)四乙腈六氟磷酸盐和异腈合成了两种等电子四基异氰基化合物四(对-异氰基苯甲醚)镍(0)和四(对异氰基苯甲醚)铜(I)六氟磷酸盐。确定结构。镍配合物在正交空间群P2(1)2(1)2(1)中结晶,a = 9.6709(8),b = 15.2324(13),c = 19.0955(16)埃,Z = 4。盐形成具有P4 / n中四边形设置的晶体,其中a = b = 15.8206(5),c = 6.5848(4)埃,Z =2。两种配合物均表现出预期的近似四面体配位环境,适用于18个带软sigma的价电子配合物-供体pi-受体配体。镍络合物中的堆积主要由弱pi-pi堆积,CH中心点中心点中心点pi(苯基)和CH中心点中心点中心点pi对异腈碳原子和氮原子的相互作用以及几个略强的CH中心构成点中心点中心点O相互作用。在铜络合物中,PF6阴离子的存在允许形成更强的C-H中心点中心点中心点F相互作用,并且这些与pi-pi堆积和C-H中心点中心点中心点O氢键结合在一起构成填充。

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