Synthesis and co-ordination chemistry of a novel dinucleating chelating triazole ligand. The crystal structure of bis-µ-[4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole-N′, µ-N1,µ-N2,N″,]-bis[aquachloro-nickel(II)] dichloride tetrahydrate
Synthesis and co-ordination chemistry of a novel dinucleating chelating triazole ligand. The crystal structure of bis-µ-[4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole-N′, µ-N1,µ-N2,N″,]-bis[aquachloro-nickel(II)] dichloride tetrahydrate
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DOI：
10.1039/dt9840002093
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发表时间：
1984
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影响因子：
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通讯作者：
Fennegien S. Keij;R. Graaff;J. Haasnoot;J. Reedijk
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文献类型：
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作者：
Fennegien S. Keij;R. Graaff;J. Haasnoot;J. Reedijk
4-氨基-3,5-二（吡啶-2-基）-1,2,4-三唑（abpt）与镍（II）和钴（II）盐反应生成双核配位化合物。其中化合物[Ni2(abpt)2Cl2(H2O)2]Cl2·4H2O在三斜空间群P中结晶，a= 6.840(2), b= 10.199(4), c= 12.480(3) a, α= 78.62(3), β= 76.47(2), γ= 84.17(3)°，Z= 1。基于4 015个独立反射的细化得到的R '值为0.034。双核的Ni2(abpt)2单元几乎是平面的。镍离子由4个氮原子配位，N-Ni-N角分别为93.00(4)、76.74(4)、113.67(4)和76.47(4)°，Ni-N距离分别为2.013(1)、2.029(1)、2.155(1)和2.164(1)A。轴向配体是一个水分子和一个氯离子。金属中心的配位是菱形扭曲的八面体。不常见的配体场光谱与这些发现一起被解释。对具有BF4 -、Cl -或Br -阴离子的NiII和CoII类似化合物的变温磁化率测量表明，这些化合物中存在相对弱的反铁磁交换。
Reaction of 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole (abpt) with nickel(II) and cobalt (II) salts produces dinuclear co-ordination compounds. One of the compounds, [Ni2(abpt)2Cl2(H2O)2]Cl2·4H2O, crystallizes in the triclinic space group P with a= 6.840(2), b= 10.199(4), c= 12.480(3)A, α= 78.62(3), β= 76.47(2), γ= 84.17(3)°, and Z= 1. Refinement based on 4 015 independent reflections yielded a value for R′ of 0.034. The dinuclear Ni2(abpt)2 unit is almost planar. The nickel ions are co-ordinated by four nitrogen atoms with N–Ni–N angles of 93.00(4), 76.74(4), 113.67(4), and 76.47(4)° and Ni–N distances of 2.013(1), 2.029(1), 2.155(1), and 2.164(1)A. The axial ligands are a water molecule and a chloride ion. The co-ordination of the metal centres is rhombically distorted octahedral. The uncommon ligand-field spectrum is interpreted along with these findings. Variable-temperature magnetic susceptibility measurements for analogous compounds of NiII and CoII with BF4–, Cl–, or Br– anions revealed that a relatively weak antiferromagnetic exchange is present in these compounds.