Macrocyclic Complexes of Niobium(III): Synthesis, Structure, and Magnetic Behavior of Mononuclear and Dinuclear Species That Incorporate the [P2N2] System
Macrocyclic Complexes of Niobium(III): Synthesis, Structure, and Magnetic Behavior of Mononuclear and Dinuclear Species That Incorporate the [P2N2] System
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铌(III)大环配合物：包含[P2N2]系统的单核和双核物质的合成、结构和磁性行为
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
S. Rettig
中科院分区：
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作者：
M. D. Fryzuk;Christopher M. Kozak;Michael R. Bowdridge;W. Jin;Dean Tung;and Brian O. Patrick;S. Rettig
介绍了两种混合供体大环配体 R[P2N2]（其中 R[P2N2] = RP(CH2SiMe2NSiMe2CH2)2PR，R = 环己基 (Cy) 或苯基 (Ph)）与铌 (III) 的配位化学。二锂前体 R[P2N2]Li2(S)（R = Cy，S = THF；R = Ph，S = 1,4-二恶烷）与 NbCl3(DME)（DME = 1,2-二甲氧基乙烷）反应生成配合物 R[P2N2]NbCl（R = Cy, 1；R = Ph, 2）。对于R = Cy，单晶X射线衍射研究和变温磁化率测量表明1在固态下是单核；然而，由于反铁磁交换的观察，类似的变温磁数据表明2在固态下是双核的。在溶液中，2 显然是与 1 相似的单体。这些单核配合物之间的加合物形成也很明显； 2 与中性供体和配位溶剂反应生成单核衍生物 Ph[P2N2]NbCl(L) (L = py, CO, PMe3, THF, MeCN)，其中吡啶加合物 3e 已被...
The coordination chemistry of the two mixed donor macrocyclic ligands R[P2N2] (where R[P2N2] = RP(CH2SiMe2NSiMe2CH2)2PR, R = cyclohexyl (Cy) or phenyl (Ph)) with niobium(III) is presented. The reaction of the dilithio precursors R[P2N2]Li2(S) (R = Cy, S = THF; R = Ph, S = 1,4-dioxane) with NbCl3(DME) (DME = 1,2-dimethoxyethane) generates the complexes R[P2N2]NbCl (R = Cy, 1; R = Ph, 2). For R = Cy, single-crystal X-ray diffraction studies and variable-temperature magnetic susceptibility measurements indicate that 1 is mononuclear in the solid state; however, analogous variable-temperature magnetic data suggest that 2 is dinuclear in the solid state due to the observation of antiferromagnetic exchange. In solution, 2 is apparently monomeric similar to 1. Adduct formation between these mononuclear complexes is also evident; reaction of 2 with neutral donors and coordinating solvents produces the mononuclear derivatives Ph[P2N2]NbCl(L) (L = py, CO, PMe3, THF, MeCN), of which the pyridine adduct, 3e, has been...