Solvent‐Dependent cis/trans Isomerism at the Paddlewheel Mo2 Core of Linear Tetranuclear Clusters of MoII and CuI Supported by 6‐(Diphenylphosphanyl)pyridin‐2‐olate (pyphos)

Solvent‐Dependent cis/trans Isomerism at the Paddlewheel Mo2 Core of Linear Tetranuclear Clusters of MoII and CuI Supported by 6‐(Diphenylphosphanyl)pyridin‐2‐olate (pyphos)
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6-(二苯基膦酰基)吡啶-2-油酸酯 (pyphos) 支持的 MoII 和 CuI 线性四核簇的桨轮 Mo2 核心的溶剂依赖性顺/反异构现象

DOI:
10.1002/ejic.201000896
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发表时间:
2010
影响因子:
2.3
通讯作者:
K. Mashima
K. Mashima
中科院分区:
化学3区
文献类型:
--
作者:
K. Pal;Keisuke Nakao;K. Mashima

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[Mo 2(pyphos)4 ](1)(pyphos = 6-二苯基膦基-2-吡啶酮)与[Cu(NCCH 3)4 ](PF 6)在CH 2 Cl 2和CH 3 CN混合溶剂(1:5 v/v)中反应,生成了一个线性四核簇合物cis-[Mo 2 {Cu(NCCH 3)2 ]-[(pyphos)4 ](PF 6)2(cis-2a-PF 6),其热力学产物的结构表征为四[3,5-二(三氟甲基)苯基硼酸]盐(cis-2a-BArF).在cis-2a-BArF的固态结构中,Mo 2核以顺式方式被两个O-N螯合的pyphos配体桥接,与1中的反式形成鲜明对比。反式异构体(反式-2b-PF 6)从非配位溶剂,如二氯甲烷分离和结构表征。从反式-2b到顺式-2a的转化在乙腈中进行的桨轮Mo 2核心溶解后,在乙腈中,其中的配位溶剂稳定的瞬态,配位不饱和的Mo 2核心后,从Mo 2核心的吡啶酮部分释放的分子内重排,而逆反应没有发生在任何试验条件下。顺式-2a-PF 6和反式-2b-PF 6的Cu中心进一步与Et 4 NCl发生取代反应,分别得到顺式-3a和反式-3b,分子式为[Mo 2(pyphos)4Cu 2(Cl)2 ].通过改变溶剂,化合物trans 3a和顺式3b不显示任何溶剂依赖性互变现象。
The treatment of [Mo 2 (pyphos) 4 ] (1) (pyphos = 6-diphenyl-phosphanyl-2-pyridonate) with [Cu(NCCH 3 ) 4 ](PF 6 ) in CH 2 Cl 2 and CH 3 CN mixed solvent (1:5 v/v) led to the formation of a linear tetranuclear cluster, cis-[Mo 2 {Cu(NCCH 3 ) 2 ]-[(pyphos) 4 ](PF 6 ) 2 (cis-2a-PF 6 ), as a thermodynamic product that was structurally characterized as a tetrakis[3,5-bis(trifluoromethyl)phenylborate] salt (cis-2a-BArF). In the solid-state structure of cis-2a-BArF, the Mo 2 core was bridged by two O-N chelating pyphos ligands in a cis fashion, in sharp contrast to a trans fashion in 1. The trans isomer (trans-2b-PF 6 ) was isolated from a noncoordinating solvent such as CH 2 Cl 2 and structurally characterized. The transformation from trans-2b to cis-2a proceeded in acetonitrile by means of an intramolecular rearrangement of the paddlewheel Mo 2 core upon dissolution in acetonitrile, in which the coordinating solvent stabilizes the transient, coordinatively unsaturated Mo 2 core upon the release of the pyridonate moiety from the Mo 2 core; whereas the reverse reaction did not occur under any trial conditions. A further substitution reaction at the Cu center of cis-2a-PF 6 and trans-2b-PF 6 with Et 4 NCl afforded cis-3a and trans-3b, respectively, which have the molecular formula [Mo 2 (pyphos) 4 Cu 2 (Cl) 2 ]. Compounds trans-3a and cis-3b do not show any solvent-dependent interconversion phenomena by changing the solvent.
DOI: --
发表时间: 2009
期刊: Inorganic Chemistry 48
影响因子: --
作者:
Fujiwara;S;岩渕真木子;岩渕真木子;岩渕真木子;岩渕 真木子;岩渕 真木子;Kazushi Mashima
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发表时间: 2004-09
期刊: Angewandte Chemie
影响因子: --
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