首页> 外文期刊>Chemistry: A European journal >Deep blue mixed-valent (PtPtPtII)-Pt-III-Pt-III complex [Pt3Br2(mu-pz)(6)] (pz = pyrazolate) showing valence-detrapping behavior in solution
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Deep blue mixed-valent (PtPtPtII)-Pt-III-Pt-III complex [Pt3Br2(mu-pz)(6)] (pz = pyrazolate) showing valence-detrapping behavior in solution

机译:深蓝色混合价(PtPtPtII)-Pt-III-Pt-III配合物[Pt3Br2(mu-pz)(6)](pz =吡唑酸酯)在溶液中显示化合价行为

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摘要

The oxidation of the pyrazolate bridged cyclic Pt-II trimer, [Pt-3(mu-pz)(6)] (1), in the presence of bromide ion gave a deep blue mixed-valent Pt-II,Pt-III,Pt-III complex, [Pt3Br2(mu-pz)(6)] (2). The structural analysis of 2 disclosed that the complex has localized Pt-Pt bond. Our theoretical calculations revealed that the HOMO and LUMO of Pt-3(III,III,III) species mainly consists of (d(sigma)-d(sigma)) and (d(sigma)-d(sigma))* orbitals, respectively, and the origin of deep blue color of the bromo complex, 2, arises from the (d(sigma)-do)->(d(sigma)-d(sigma))* transition. Unique fluxional behavior was observed due to valence-detrapping of 2 in solution. The activation parameters of the valence-detrapping of 2 obtained by Eyring analyses were Delta H-#=37(2) kJ mol(-1) and Delta S-#=-67(7) J mol(-1) K-1.
机译:在存在溴离子的情况下,吡唑酸酯桥连的环状Pt-II三聚体[Pt-3(mu-pz)(6)](1)的氧化得到深蓝色混合价Pt-II,Pt-III, Pt-III配合物,[Pt3Br2(mu-pz)(6)](2)。 2的结构分析表明,该配合物具有局部Pt-Pt键。我们的理论计算表明,Pt-3(III,III,III)物种的HOMO和LUMO主要由(d(sigma)-d(sigma))和(d(sigma)-d(sigma))*轨道组成,溴配合物2的深蓝色起源分别来自(d(sigma)-do)->(d(sigma)-d(sigma))*跃迁。由于在溶液中的2价化合,观察到了独特的通量行为。通过Eyring分析获得的2的化合价激活因子为Delta H-#= 37(2)kJ mol(-1)和Delta S-#=-67(7)J mol(-1)K-1 。

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