Mononuclear cobalt(II) carboxylate complexes: Synthesis, molecular structure and selective oxygenation study
作者:Udai P. Singh、Vaibhave Aggarwal、Asish K. Sharma
DOI:10.1016/j.ica.2007.03.026
日期:2007.7
binuclear cobalt(II) complex [ ( 3 , 5 - Pr 2 i pzH ) 2 Co 2 ( μ - 3 , 5 - Pr 2 i pz ) 2 ( NO 2 -OBz ) 2 ] (6) was prepared by the reaction of hydrated cobalt(II) nitrate, 3,5-diisopropylpyrazole and sodium nitrobenzoate where, each cobalt is four coordinate. The X-ray structure of 6 showed that the NH fragment of terminally coordinated 3 , 5 - Pr 2 i pzH formed intramolecular hydrogen bonding with nonbonded
摘要以受阻氢三(3,5-二异丙基-1-吡唑基)硼酸酯(TpiPr2)为支撑配体,制备了一些羧酸钴(单核和双核)配合物。[TpiPr2Co(NO3)](2)与苯甲酸钠的反应导致乙腈配位配合物[TpiPr2Co(OBz)(CH3CN)](3)的形成,而2与氟苯甲酸钠的反应则给出了配位不饱和的五坐标类型[TpiPr2Co(F-OBz)](4)。在3,5-二异丙基吡唑3,5-Pr 2 i pzH存在下化合物4的氧化导致形成独特的化合物[Co(F-OBz)HB(3-OCMe 2-5-Pr i pz )(3,5-Pr 2 i pzH)2}(3,5-Pr 2 i pzH)](5)其中,hydrotris(3,5-二异丙基-1-吡唑基)硼酸酯被氧化并与钴中心配位。在化合物5中,氟苯甲酸酯的结合行为也从二齿改变为单齿,并且未键合的氧原子与配位的3,5-Pr 2 i pzH的NH片段的氢原子形成分子内氢键。