Synthesis, characterization and preliminary reactivity behaviors with transitional metals of a new polydentate N-donor ligand

In this paper, one new polydentate N-donor ligand of 2-morpholin-4-yl-4,6-di-pyrazol-1-yl-[1,3,5]-triazine (L) has been synthesized and characterized. Reactions of L with CoCl2 center dot 6H(2)O, Co(NO3)(2)center dot 6H(2)O, CrCl3 center dot 6H(2)O, MnCl2 center dot 4H(2)O and Fe(NO3)(3)center dot 9H(2)O result in the formation of [CoCl2(L)] (1), [Co(NO3)(2)(L)]center dot(MeCN) (2), [CrCl3(L)]center dot 2(MeCN) (3), [MnCl2(L)]center dot 0.5(CH3CH2OH) (4) and [Fe-2(NO3)(4)(L)(2)(mu-O)]center dot(H2O) (5) respectively, which have been successfully characterized and determined by FT-IR, elemental analysis, thermogravimetric measurement and single-crystal X-ray crystallography. In the molecular and supramolecular structures, different non-covalent interactions are present including hydrogen bonds, pi-pi and anion-pi interactions. 1 shows strong chain-shaped pi-pi interactions of infinite aromatic rings, and 2 or 3 indicate fragmentary pi-pi interactions of six or two aromatic rings, respectively. Anion-pi interactions have been observed in 4 and 5. In addition, weak hydrogen bonds have been found in 1-5, and supramolecular ladders and chains via hydrogen bonds have been viewed in the packing structures of 4 and 5. In conclusion, non-covalent interactions play significant roles in the stabilization of 1-5. (C) 2014 Elsevier B.V. All rights reserved.