Two new zinc(II) acetates with 3- and 4-aminopyridine: syntheses and structural properties.

Brina Dojer,Ferdinand Belaj,Andrej Pevec,Matjaž Kristl

doi:10.17344/acsi.2014.1111

Abstract

The synthesis and characterization of two new zinc(II) coordination compounds with 3- and 4-aminopyridine are reported. They were obtained after adding a water solution of Zn(CH3COO)2·2H2O or dissolving solid Zn(CH3COO)2 ∙ 2H2O in methanol solutions of 3- and 4-aminopyridine. The products were characterized structurally by single-crystal X-ray diffraction analysis. Colourless crystals of the compound synthesized by the reaction of Zn(CH3COO)2·2H2O and 3-aminopyridine (3-apy), are built of trinuclear complex molecules with the formula [Zn3(O2CCH3)6(3-apy)2(H2O)2] (1). The molecules consists of two terminal Zn atoms, coordinated tetrahedrally, and one central Zn atom, coordinated octahedrally. Colourless crystals, obtained by the reaction of Zn(CH3COO)2·2H2O with 4-aminopyridine (4-apy), consist of a mononuclear complex [Zn(O2CCH3)2(4-apy)2] (2). Hydrogen‒bonding interactions in the crystal structures of both complexes are reported.

Highlights

Zinc is an important trace element in human body, second only to iron among elements for which human nutritional requirement has been established
Colourless crystals of the compound synthesized by the reaction of Zn(CH3COO)2 · 2H2O and 3-aminopyridine (3-apy), are built of trinuclear complex molecules with the formula [Zn3(O2CCH3)6(3apy)2(H2O)2](1)
Zinc coordination compounds with carboxylate ligands are important as building modes for metal organic frameworks (MOFs),[11,12,13,14,15] i.e. compounds consisting of metal ions coordinated to organic molecules to form supramolecular structures

Summary

Introduction

Zinc is an important trace element in human body, second only to iron among elements for which human nutritional requirement has been established. Zinc coordination compounds with carboxylate ligands are important as building modes for metal organic frameworks (MOFs),[11,12,13,14,15] i.e. compounds consisting of metal ions coordinated to organic molecules to form supramolecular structures Such materials have been studied for many applications, including hydrogen storage, catalysis, and nonlinear optics.[16,17] Carboxylate ligands are among the common ligands in preparation of MOFs, while recently, N-donor ligands have attracted increasing attention in preparation of interesting supramolecular complexes.[17] As a d10 metal ion, Zn2+ is suited for the construction of coordination networks.[18,19] Carboxylate ligands can coordinate to metals in many ways: as monodentate, chelate, bidentate bridging in a syn-syn, syn-anti or anti-. Coordination varieties depend on many factors such as nature of the ligands, preparation methods, used solvents and temperature of the reacting system.[22,23,24,25]

Results and Discussion

Experimental

Conclusions