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- W2054798900 abstract "Abstract The Schiff base ligand (1) and its Zn(II) complex (2) have been synthesized and their crystal structures have been determined. Compound (1) crystallizes in the monoclinic space group C2/c with a=26.993(2), b=5.891(1), c=16.000(2) A , β=103.29(1)°, V=2476.0(6) A 3 , Z=8 and D x =1.332 g cm −3 Compound (2) crystallizes in the orthorhombic space group Pbca with a=19.580(3), b=9.416(2), c=27.801(2) A , V=5125.5(6) A 3 , Z=8 and D x =1.451 g cm −3 In the crystal structure of the free Schiff base ligand (1), the existence of a strong intramolecular N–H⋯O hydrogen bond [ N⋯O =2.572(4), N–H =0.90(4), H⋯O =1.759(4) A , N–H⋯O =149.6(3)° ] is observed. The C–N amine bond and C–N–C bond angle are 1.345(4) A and 124.4(3)°, respectively. The C3 O1 and C4 C5 bond lengths [1.274(4) and 1.351(5) A] are shortened by the pronounced quinoidal effect. In solution, compound (1) is in tautomeric equilibria (phenol–imine, O–H⋯N keto-amine, O⋯H–N forms), as supported by 1H NMR and UV–visible data. In the crystal structure of the Zn(II) complex (2), zinc atom has a distorted tetrahedral coordination. One of the pyridine N atom of the ligands is in close contact with the Zn(II) atom [ Zn1⋯N4 =2.864(5) A ]. It is interesting that the C–N amine bond [1.345(4) A] in compound (1) changes to the imine bond [1.27(5) A] in the Zn(II) complex (2)." @default.
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- W2054798900 date "2000-05-01" @default.
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- W2054798900 title "Intramolecular hydrogen bonding and tautomerism in Schiff bases. Part II. Structures of 1-[ N -(2-pyridyl)aminomethylidene}-2(1H)-naphtalenone (1) and bis[2-hydroxy-κ O – N -(2-pyridyl)-1-naphthaldiminato-κ N ]zinc(II) (2)" @default.
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- W2054798900 doi "https://doi.org/10.1016/s0022-2860(99)00376-2" @default.
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