CRYSTAL STRUCTURE OF AN END-ON AZIDO-BRIDGED POLYMERIC ZINC(II) COMPLEX
A new end-on azido-bridged polymeric zinc(II) complex [Zn2ClL(P1,1-N3)]n, where L is the dianionic form of N,Nc-bis(5-fluoro-2-hydroxybenzylidene)-2-hydroxy-1,3-propanediamine, is prepared and structurally characterized by elemental analysis and single crystal X-ray diffraction. The complex crystallizes in the monoclinic space group P21/c, with unit cell dimensions a = 9.194(1) Å, b = 22.356(2) Å, c = 9.598(1) Å, E = 95.869(3)q, V = 1962.5(4) Å3, Z = 4, R1 = 0.0691, and wR2 = 0.1642. The inner Zn atom of the [Zn2ClL] unit is coordinated by the imino N and phenolate O atoms of L and one azido N atom, forming a square pyramidal geometry. The outer Zn atom of the [Zn2ClL] unit is coordinated by two phenolate O of L, one Cl ligand, and one N atom of the bridging azide group, forming a tetrahedral geometry. The ZnѱZn distance in the [Zn2ClL] unit is 3.072(2) Å. The [Zn2ClL] units are linked through endon azido bridges, forming 1D chains running along the c axis.
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The inner Zn atom of the [Zn2ClL] unit is coordinated by the imino N and phenolate O atoms of L and one azido N atom, forming a square pyramidal geometry. <...> The outer Zn atom of the [Zn2ClL] unit is coordinated by two phenolate O of L, one Cl ligand, and one N atom of the bridging azide group, forming a tetrahedral geometry. <...> The [Zn2ClL] units are linked through endon azido bridges, forming 1D chains running along the c axis. <...> Bis-Schiff bases derived from salicylaldehyde and its derivatives with diamines are a kind of versatile ligands in coordination chemistry. <...> Among the bridging groups, the azide ligand has received particular interest because it is very useful to design extended polynuclear complexes. <...> It can bind up to three metal atoms when acting as a monatomic bridge (end-on, EO) and up to six using the two terminal nitrogen atoms to bridge (end-to-end, EE) (Scheme 1) [ 8—10]. <...> N,N-Bis(2-hydroxybenzylidene)-2-hydroxy-1,3propanediamine and its derivatives have been used as bis-Schiff bases in the construction of complexes with various metal atoms [14—17 ]. <...> However, no zinc complexes derived from such bis-Schiff bases have been reported. <...> As a continuation of the work on the self-assembly preparation of azidobridged polymeric complexes, in this paper, a new end-on azido-bridged polymeric zinc(II) complex [Zn2ClL(1,1-N3)]n, where L is the dianionic form of N,N-bis(5-fluoro-2-hydroxybenzylidene)2-hydroxy-1,3-propanediamine (H2L, Scheme 2), was prepared and structurally characterized. <...> Schiff base H2L ligand analyses were performed on a Perkin-Elmer 240C elemental analyzer. <...> Single crystal structural X-ray diffraction was carried out on a Bruker D8 VENTURE PHOTON diffractometer. <...> Diffraction intensities for the complex were collected at 298(2) K using a Bruker D8 VENTURE PHOTON diffractometer with MoKh radiation (y = 0.71073 Е). <...> Selected bond lengths and angles are given in Table 2. <...> The Schiff base H2L was prepared by the condensation reaction in the 2:1 molar ratio of 5-fluorosalicylaldehyde with 1,3-diaminopropan-2-ol in methanol. <...> Zn distance in the [Zn2ClL] unit is 3.072(2) Е. The inner Zn atom of the [Zn2ClL] unit <...>
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