Synthesis and Characterization of a Novel Unsymmetrical Tetradentate Schiff Base Complex of Zinc(II) Derived from N,N′-bis (5-Bromosalicylidene) 2,3-Diaminopyridine (H2L): Crystal Structure of [Zn(II)L]Pyridine

Yellow crystals of [Zn( N , N ′-bis (5-bromosalicylidene) 2,3-diaminopyridine)] Pyridine, [Zn(C 19 H 11 Br 2 N 3 O 2 )]C 5 H 5 N, have been obtained and characterized by elemental analysis, FT-IR, UV–Vis, 1 H NMR spectroscopy and MALDI-TOF mass spectrometry. The structure has been determined by single crystal X-ray crystallography. The complex crystallizes in the triclinic space group P-1 with two molecules in the asymmetric unit and with unit cell dimensions a = 8.0103(3) Å, b = 12.8340(5) Å, c = 22.3682(11) Å, α = 91.715(2)°, β = 93.918(2) ° , γ = 103.708(2)°. V = 2226.30(16) Å 3 , Z = 4, R 1 = 0.0780 and wR 2 = 0.1192. X-ray structure determination revealed that the complex consists of a [Zn(C 19 H 11 Br 2 N 3 O 2 )] moiety with a coordinated pyridine molecule on the metallic centre. The zinc atom adopts a distorted square pyramidal geometry as it is shown in the crystal structure. Graphical Abstract A single crystal description of a unsymmetrical structure, spectroscopic and characterization with 2D NMR ROESY spectrum