A heterometallic polymer based on bis-salicylidene Schiff base ligand, synthesis, electronic chemistry, and antibacterial property

ABSTRACT

A new heterometallic complex containing bis-Schiff base, namely, [(Salbn)NiNa(DMF)(H₂O)]·N(CN)₂ (1) (Salbn = bis(3-methoxysalicylidene) benzene-1, 2-diamine, DMF = N, N-dimethyl formamide) has been prepared through one-pot refluxing and condensation approach. Complex 1 was characterized by elemental analysis, IR spectroscopy, X-ray single-crystal diffraction, and powder X-ray diffraction analysis. The intermolecular hydrogen bonding interaction connects the Schiff base complex units through the [N(CN)₂]⁻ anion into dimer aggregate. These aggregates are further linked by weak hydrogen bondings and strong π–π interactions to give rise to one-dimensional chelating double-chain supramolecular polymer. Cyclic voltammetry measurement reveals the oxidation and reduction process of the compound is irreversible in nature. Polymer 1 exhibits emission spectrum maximum at 548 nm under ultraviolet excitation. Antibacterial property measurement indicates that 1 has strong inhibition toward Staphylococcus aureus.

KEYWORDS:

• Heterometallic complex
• Schiff base
• photoluminescence
• electrochemical property
• antibacterial activity

Funding

This work was supported by the National Natural Science Foundation of China (No. 21273101, 21271098and 21302082), Ministry of Science and Technology of China (973 Project No. 2014CB660804), Foundation for Science & Technology Innovation Talents in Henan province (Nos. 2014HASTIT014 and 164100510012), and the Foundation of Education Committee of Henan province, China (No 14B150033).