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ВЛИЯНИЕ ПРИРОДНЫХ И ЭКОЛОГИЧЕСКИХ ФАКТОРОВ НА ОЦЕНКУ РЕСУРСНОГО ПОТЕНЦИАЛА БИОЭНЕРГЕТИКИ (НА ПРИМЕРЕ ОСТРОВА СВИЯЖСК)
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CHARACTERIZATION AND CRYSTAL STRUCTURE OF A NOVEL TETRANUCLEAR ZINC(II) COMPLEX DERIVED FROM N,Nc-BIS(2-HYDROXY-5-METHOXYBENZYLIDENE)PROPANE-1,3-DIAMINE
CHARACTERIZATION AND CRYSTAL STRUCTURE OF A NOVEL TETRANUCLEAR ZINC(II) COMPLEX DERIVED FROM N,Nc-BIS(2-HYDROXY-5-METHOXYBENZYLIDENE)PROPANE-1,3-DIAMINE
A novel tetranuclear zinc(II) complex [Zn4Br4L2(H2L)], where L and H2L are the dianionic and zwitterionic forms of N,Nc-bis(2-hydroxy-5-methoxybenzylidene)propane-1,3-diamine, is prepared and structurally characterized by elemental analysis, IR spectrum, and single crystal X-ray crystallography. The complex crystallizes in the monoclinic space group C2/c, with unit cell dimensions a = 38.338(2) Å, b = 10.5662(5) Å, c = 17.4607(8) Å, E = 113.767(2)q, V = = 6473.3(6) Å3, Z = 4, R1 = 0.0686, and wR2 = 0.1752. The inner Zn atoms are five-coordinated in a square pyramidal geometry, and the outer Zn atoms are four-coordinated in a tetrahedral geometry. The intramolecular ZnѱZn distance is 3.103(1) Å.
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2015. 56, 1 - – - UDC 548.73:547.13:546.47 CHARACTERIZATION AND CRYSTAL STRUCTURE OF A NOVEL TETRANUCLEAR ZINC(II) COMPLEX DERIVED FROM N,N-BIS(2-HYDROXY-5-METHOXYBENZYLIDENE)PROPANE-1,3-DIAMINE G.-H. Sheng1, X.-S. Cheng2, Z.- L. You2, H.-L. Zhu1 1School of Life Sciences, Shandong University of Technology, P. R. China E-mail: hailiang_zhu@163.com (Hai-Liang Zhu) Received May, 21, 2013 2Department of Chemistry and Chemical Engineering, Liaoning Normal University, P. R. China E-mail: youzhonglu@yahoo.com.cn (Zhong-Lu You) Revised — August, 21, 2013 A novel tetranuclear zinc(II) complex [Zn4Br4L2(H2L)], where L and H2L are the dianionic and zwitterionic forms of N,N-bis(2-hydroxy-5-methoxybenzylidene)propane-1,3-diamine, is prepared and structurally characterized by elemental analysis, IR spectrum, and single crystal X-ray crystallography. <...> The inner Zn atoms are five-coordinated in a square pyramidal geometry, and the outer Zn atoms are four-coordinated in a tetrahedral geometry. <...> Polynuclear structures of complexes with bridging groups are currently attracting much attention for their interesting structures and wide applications [ 1—3]. <...> Schiff bases derived from salicylaldehyde and its derivatives are a kind of versatile ligands in coordination chemistry. <...> The rational design and construction of polynuclear structures of complexes with Schiff bases are of particular interest in coordination and structural chemistry. <...> A preferred way to construct polynuclear complexes is the use of suitable bridging groups, such as 3N , NCS–, N(CN) , dicarboxylate, 4,4-bipy, and so on [ 4—7]. 2 A number of polynuclear complexes derived from bis-Schiff bases have been reported [ 8—10 ]. <...> As a continuation of our work on preparing polynuclear complexes with novel structures, in this paper, a new bis-Schiff base ligand across-bridged tetranuclear zinc(II) complex [Zn4Br4L2(H2L)], where L and H2L are the dianionic and zwitterionic forms of N,N-bis(2-hydroxy-5-methoxybenzylidene)propane1,3-diamine (Scheme 1), was obtained. <...> The yellow crystalline product of the Schiff base was prepared by a reaction of 5-methoxysalicylaldehyde (0.02 mol, 3.04 g) with propane-1,3-diamine (0.01 mol, 0.74 g) in methanol and subsequent evaporation of the solvent. <...> The amino hydrogen atom was <...>
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