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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Coordination preferences of 3,3 '-biisoxazolidines: A new kind of conformationally flexible chelating ligand
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Coordination preferences of 3,3 '-biisoxazolidines: A new kind of conformationally flexible chelating ligand

机译:3,3'-二异恶唑烷的配位偏爱:一种新型的构象柔性螯合配体

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摘要

3,3'-Bi{2-methyl-5-Ar}isoxazolidines (Ar = 2-Py, L-1; Ph, L-2) were designed as new conformational flexible N-donor multidentates. They readily form complexes with metal ions and the coordination preferences of the ligands were characterized by means of H-1 NMR spectroscopy and X-ray crystallography. In the [(Cp*IrCl2)(2){L-1}] complex the ligand bridges two iridium ions employing pyridyl-N functions, while in [Cp*Ir(L-2)Cl]Cl and Cu{L-2}Cl-2 (.) CHCl3 the ligand forms five-membered chelates via the isoxazolidine nitrogen atoms. Tridentate coordination in [Ni{L-1}(H2O)(NO3)]NO3 supports formation of two chelates involving donors of two isoxazolidine and of pyridyl groups, with a facial arrangement of the binding sites around octahedral Ni ions. In associate [UO2(CH3OH)(2)(NO3)(2)] (.) L-1 the non-coordinating biisoxazolidine is involved in hydrogen bonding with molecular bis-methanol uranyl nitrate moieties. (c) 2005 Elsevier Ltd. All rights reserved.
机译:3,3'-Bi {2-甲基-5-Ar}异恶唑烷(Ar = 2-Py,L-1; Ph,L-2)被设计为新的构象柔性N-供体多齿。它们容易与金属离子形成络合物,并且通过H-1 NMR光谱和X射线晶体学表征了配体的配位偏好。在[(Cp * IrCl2)(2){L-1}]络合物中,配体通过吡啶基-N功能桥接两个铱离子,而在[Cp * IrCl(L-2)Cl] Cl和Cu {L-2 } Cl-2(。)CHCl3配体通过异恶唑烷氮原子形成五元螯合物。 [Ni {L-1}(H2O)(NO3)] NO3中的三齿配位支持形成涉及两个异恶唑烷和吡啶基的供体的两个螯合物,其八面体Ni离子的结合位点呈面部排列。在缔合[UO2(CH3OH)(2)(NO3)(2)](。)L-1中,非配位联异唑烷与分子双甲醇双氧铀酰硝酸基团氢键合。 (c)2005 Elsevier Ltd.保留所有权利。

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