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Rhenium chelate complexes with maltolate or kojate

机译:hen螯合物与麦芽糖或曲酸

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Novel rhenium complexes containing the maltolate (mal) or kojate (koj) anions as chelating ligands have been synthesized: [ReOCl(mal)(2)] (1), [ReOCl2(mal)(PPh3)] (2), [ReOBr2(mal)(PPh3)] (3), [ReOCl2(koj)(PPh3)] (4) and [ReOBr2(koj)(PPh3)] (5). The products have been characterized by MR, H-1, C-13, and P-31 NMR spectroscopies and elemental analysis. The crystal and molecular structures of all complexes were determined. Complex I crystallizes monoclinic, space group C2/c, Z = 8. It contains two O, O'-bidentate maltolate ligands and one chloro ligand at the (ReO)(3+) unit, so that a distorted octahedral geometry is adopted by the six-coordinated rhenium(V) center. The chloro ligand occupies a cis position to the oxo ligand. Complexes 2 and 3 are isostructural and crystallize orthorhombic, space group Pbca and Z = 8. The isostructural complexes 4 and 5 crystallize monoclinic, space group P2(1) and Z = 4. In complexes 2-5, the (ReO)(3+) unit is coordinated by a monoanionic O,O-bidentate unit of the maltolate (2 and 3) or kojate (41 and 5) ligand, one triphenylphosphine and two halogeno ligands (Cl in 2 and 4; Br in 3 and 5), with the rhenium(V) center in a distorted octahedral environment. The halide ligands are in cis positions to each other. (c) 2008 Elsevier Ltd. All rights reserved.
机译:合成了含有麦芽酸(mal)或kojate(koj)阴离子作为螯合配体的新型rh络合物:[ReOCl(mal)(2)](1),[ReOCl2(mal)(PPh3)](2),[ReOBr2 (mal)(PPh3)](3),[ReOCl2(koj)(PPh3)](4)和[ReOBr2(koj)(PPh3)](5)。产品已通过MR,H-1,C-13和P-31 NMR光谱学和元素分析进行​​了表征。确定了所有配合物的晶体和分子结构。配合物I结晶为单斜晶,空间群C2 / c,Z =8。它在(ReO)(3+)单元上包含两个O,O'-双齿麦芽酸酯配体和一个氯配体,因此采用了扭曲的八面体几何结构六坐标rh中心。氯配体相对于氧代配体占据顺式位置。配合物2和3是同构的且结晶为正交晶,空间群Pbca和Z =8。同构配合物4和5结晶为单斜晶,空间群P2(1)/ n和Z =4。在配合物2-5中,(ReO) (3+)单元由麦芽酸酯(2和3)或曲酸(41和5)配体,一个三苯基膦和两个卤代配体(2和4中的Cl; 3和3中的Br)的单阴离子O,O-双齿单元协调5),center(V)中心处于扭曲的八面体环境中。卤化物配体彼此处于顺式位置。 (c)2008 Elsevier Ltd.保留所有权利。

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