Synthesis and crystal structure of a zinc(II) coordination polymer: N-(2-pyridylmethyl)- L-alanine)isothiocyanate Zn(II)

Abstract

The title compound, N-(2-pyridylmethyl)-L-alanine) zinc(II), [Zn(C₁₀H₁₁N₃O₂S)], a coordination polymer derived from the mixed ligands, N-(2-pyridylmethyl)-L-alanine (HL1) and ammonium thiocyanide (L2) has been synthesized and characterized by IR spectroscopy, ¹H-NMR, elemental analysis, thermogravimetric analysis and single crystal x-ray structure determination.The single crystal X-ray structure analysis of the title compoundreveals a molecular polymeric compound that crystallizes in the orthorhombic crystal system and P2(1)2(1)2(1) space group. The ligand acts as a bridge between adjacent zinc(II) centres, each of which adopts a five-coordinate geometry.  Zinc bonds to two N atoms and one O atom of HL1, one N atom of L2 and one O atom of another HL1 ligand. This is confirmed by IR spectroscopy. Thermogravimetric analysis shows a one-step decomposition of the complex to leave a zinc sulfide residue.

KEY WORDS: Zinc(II), N-(2-pyridylmethyl)-(L)-alanine) ligand, Isothiocyanate, Coordination polymer, Single crystal structure

Bull. Chem. Soc. Ethiop. 2020, 34(2), 285-293

DOI: https://dx.doi.org/10.4314/bcse.v34i2.7