Manganese(II), lead(II) and cadmium(II) coordination complexes containing a tetrazole-based acylamide ligand: synthesis and the influence of the metal ions on the structures

Abstract

Three new manganese(II), lead(II) and cadmium(II) coordination complexes have been prepared by reaction of N-(1H-tetrazol-5-yl)cinnamamide (HNTCA) with divalent metal salts (MnCl, PbCl and CdCl) in a mixed-solvent system, affording mononuclear to trinuclear structures namely, bis(methanol-κO)bis[5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido-κN,O]manganese(II), [Mn(CHNO)(CHOH)], (1), bis[μ-5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido]-κN,O:N;κN:N,O-bis{aqua[5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido-κN,O]lead(II)}, [Pb(CHNO)(HO)], (2), and hexakis[μ-5-(3-phenylprop-2-enamido)-1H-1,2,3,4-tetrazol-1-ido-κN,O:N]tricadmium(II), [Cd(CHNO)], (3). The structures of these three compounds reveal that the nature of the metal ions and the side groups of the organic building blocks have a significant effect on the structures of the coordination compounds formed. Intermolecular hydrogen bonds link the molecules into two-dimensional [complex (1)] and three-dimensional hydrogen-bonded networks. Complexes (2) and (3) show significant fluorescence, while complex (1) displays no fluorescence.

Highly Sensitive Colorimetric Detection of the Toxic Metal Cadmium in Rice Using a New TAA@AuNPs Sensor

“…Therefore, it is necessary to propose a new simple visual and rapidly effective detection way for Cd 2+ with high sensitivity and good selectivity in rice samples. Metal ions have been proven to easily form complexes with amines, benzimidazolyl, and hydroxyl groups because of their great a nity for each other (Dou et al 2013;Lin et al 2018;Liu et al 2010). In this work, we use AuNPs modi ed by TAA to detect the Cd 2+ in water, soil, and rice samples.…”