Hydrothermal synthesis, characterization and properties of a d¹⁰ metal coordination polymer with a layered structure based on carboxyphosphinate ligand, 4,4^′-bipyridine and four-coordinated zinc ion

Abstract

Hydrothermal reaction of Zn(NO₃)₂ · 6 H₂O with 2-carboxyethyl(phenyl)phosphinate (H₂L) and 4,4'-bipyridine (4,4′-bipy) led to a novel zinc(II) carboxyphosphinate [ZnL(4,4′-bipy)_0.5]_n (1). The zinc ion is tetrahedrally coordinated by two phosphinate oxygen atoms, one carboxylate oxygen atom, and one nitrogen atom of 4,4′-bipy ligand. The L^2- ligand and zinc ion can be seen as three- and four-connected nodes, respectively. Compound 1 shows a layered network with (3,4)-connected topology. It exhibits a broad blue fluorescent emission band at 459 nm, which can be attributed to 4,4′-bipy intraligand emission as well as to H₂L emission. It is a diamagnetic system between 300 K and 11 K.

Graphical Abstract

Keywords:

• Hydrothermal synthesis
• zinc ion
• layered structure
• coordination polymer

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Liaoning Provincial Education Department under Grant No. L2015299.