Combined experimental and theoretical investigation of ligand and anion controlled complex formation with unprecedented structural features and photoluminescence properties of zinc(II) complexes

摘要

By using two potential tridentate ligands, HL1 [4-\udchloro-2-[(2-morpholin-4-yl-ethylimino)-methyl]-phenol] and\udHL2 [4-chloro-2-[(3-morpholin-4-yl-propylimino)-methyl]-phenol],\udwhich differ by one methylene group in the alkyl chain,\udfour new ZnII complexes, namely, [Zn(L2H)2](ClO4)2 (1),\ud[Zn(L1)(H2O)2][Zn(L1)(SCN)2] (2), [Zn(L1)(dca)]n (3), and\ud[Zn2(L1)2(N3)2(H2O)2] (4) [where dca = dicyanamide anion]\udwere synthesized and structurally characterized. The results\udindicate that the slight structural difference between the ligands,\udHL1 and HL2, because of the one methylene group connecting\udthe nitrogen atoms provokes a chemical behavior completely\uddifferent from what was expected. Any attempt to isolate the\udZn(L2) complexes with thiocyanato, dicyanamido, and azide was unsuccessful, and perchlorate complex 1 was always obtained.