Abstract
Two new zinc(II) complexes [ZnL(N3)]·BF4 (1) and [ZnBrL]·BF4 (2), derived from the tetradentate Schiff base ligand N,N′-bis(1-pyridin-2-yl-ethylidene)propane-1,3-diamine (L), are prepared and characterized by physicochemical methods and single crystal X-ray crystallography. The crystal of (1) is triclinic: space group P-1, a = 8.593(1) A, b = 8.752(1) A, c = 13.393(2) A, α = 97.153(1)°, β = 93.046(1)°, γ = 91.577(1)°, V = 997.4(2) A3, Z = 2. The crystal of (2) is triclinic: space group P-1, a = 8.351(1) A, b = 8.956(1) A, c = 13.139(2) A, α = 92.716(1)°, β = 94.241(2)°, γ = 95.016(1)°, V = 974.8(2) A3, Z = 2. The geometries of the penta-coordinated zinc atoms in both complexes are intermediate between the square pyramid and the trigonal bipyramid having the Addison parameters of 0.39 and 0.47 respectively. The syntheses of the complexes show distinct preference for the anions in the order Br− > N3− > CH3COO−.
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