Based On The Synthesis Of Heterocyclic Organometallic Compounds, Structure And Nature

In this paper, twelve novel bistetrazoylamine (H2bta) based organic-metal compounds [Na2Cu(bta)2(H2O)8]·H2O (1), [Cu(H2bta)Cl2(H2O)]·2H2O (2), Cu(bta)(en)(H2O) (3), Cu(bta)(pn)(H2O) (4), [Cu(Hbta)2]·4H2O (5), [Cu(Hbta)2]2·9H2O (6), Fe(Hbta)2(H2O)2 (7), [Fe(bpy)2(bta)]·6H2O (8), [Co(Hbta)(en)2](ClO4) (9), [Co(Hbta)2(pn)]2(pn)(H2O)9 (10), [Ni(en)2][Ni(bta)(en)2](ClO4) (11) and [Cu(pn)2][Co(bta)2(pn)]2(H2O)2 (12) (bpy = 2,2'-bipyridine, en = ethylenediamine, pn = propane diamine) have been synthesized and their single crystal structure have also been characterized by X-ray determination. For the twelve coordination compounds, 1, 5, 6 and 11 show 1-D structure, and the four one-dimensional compounds can be divided into three different types of 1-D chain model: 1 and 6 are zigzag chain with parallel fashion, 5 is helical chain with parallel fashion while 11 possesses a staggered fashioned 1D zigzag chain structure. 12 exhibits tri-nuclear 0-D structure, and the rest of them are of simple mono-nuclear core. In the further analysis of the synthesis procedure, we find that basic environment and excessive metal salts contributes to the formation of 1-D or higher dimensional products, while excessive amount of ligand leads to the formation of mononuclear compounds.The ultraviolet absorption of their aqueous solution are mostly the same as those of the H2bta ligand. The emission spectrum of 11 was recorded. 7 and 8 are the rarely reported Fe-bta complexes. The cyclic voltammogram (CV) and the thermogravimetric analysis measurements of them were performed, the decomposition temperature turns out to be as high as 350℃, which is in accordance with other tetrazole compounds. Both H2bta and 8 showed conjugated peaks in cyclic voltammogram curve, which indicates that H2bta can act as a good reducing ligand.