Ghaemi Akbar, Rayati Saeed, Fayyazi Kazem, Ng Seik Weng, Tiekink Edward R T
Acta Crystallogr Sect E Struct Rep Online. 2012 Aug 1;68(Pt 8):m1027-8. doi: 10.1107/S1600536812029662. Epub 2012 Jul 4.
Two distinct coordination geometries are found in the binuclear title complex, [Ni(2)(C(13)H(19)N(2)O(2))(2)(N(3))(2)(CH(3)OH)], as one Schiff base ligand is penta-dentate, coordinating via the anti-cipated oxide O, imine N and amine N atoms (as for the second, tridentate, ligand) but the oxide O is bridging and coordination also occurs through the meth-oxy O atom. The Ni(II) atoms are linked by a μ(2)-oxide atom and one end of a μ(2)-azide ligand, forming an Ni(2)ON core. The coordination geometry for the Ni(II) atom coordinated by the tridentate ligand is completed by the meth-oxy O atom derived from the penta-dentate ligand, with the resulting N(3)O(3) donor set defining a fac octa-hedron. The second Ni(II) atom has its cis-octa-hedral N(4)O(2) coordination geometry completed by the imine N and amine N atoms of the penta-dentate Schiff base ligand, a terminally coordinated azide N and a methanol O atom. The arrangement is stabilized by an intra-molecular hydrogen bond between the methanol H and the oxide O atom. Linear supra-molecular chains along the a axis are formed in the crystal packing whereby two amine H atoms from different amine atoms hydrogen bond to the terminal N atom of the monodentate azide ligand.
在双核标题配合物[Ni₂(C₁₃H₁₉N₂O₂)₂(N₃)₂(CH₃OH)]中发现了两种不同的配位几何结构，其中一个席夫碱配体是五齿的，通过预期的氧化物O、亚胺N和胺N原子配位（第二个配体为三齿），但氧化物O是桥连的，并且还通过甲氧基O原子发生配位。Ni(II)原子通过一个μ₂-氧化物原子和一个μ₂-叠氮配体的一端相连，形成一个Ni₂ON核。由三齿配体配位的Ni(II)原子的配位几何结构由来自五齿配体的甲氧基O原子完成，所得的N₃O₃供体集定义了一个面式八面体。第二个Ni(II)原子的顺式八面体N₄O₂配位几何结构由五齿席夫碱配体的亚胺N和胺N原子、一个端基配位的叠氮N和一个甲醇O原子完成。这种排列通过甲醇H和氧化物O原子之间的分子内氢键得以稳定。在晶体堆积中沿a轴形成了线性超分子链，其中来自不同胺原子的两个胺H原子与单齿叠氮配体的端基N原子形成氢键。
