A SHG-active manganese coordination polymer with noncentrosymmetric structure based on achiral carboxyphosphinate ligand

Abstract

The hydrothermal reaction of MnSO₄ with the achiral 2-carboxyethyl(phenyl)phosphinate ligand (H₂L) afforded a 2 D coordination polymer manganese phosphinate, [Mn(HL)₂]_n (1) (H₂L = 2-carboxyethyl(phenyl) phosphinic acid). It contains two types of dimeric ring motifs, which can generate a layer structure through edge-sharing. The interlayer stacking by C-H…π interactions between the C-H groups of the phenyl rings of HL^- and the phenyl rings of the adjacent layers results in its crystallization in a noncentrosymmetric crystal structure with (4³)₂(4⁶·6⁶·8³) topology. Compound 1 shows a second harmonic generation response that is 0.8 times that of urea. The luminescence spectrum indicates an emission maximum at 457 nm, attributed to an intra-ligand emission state.

Graphical Abstract

Keywords:

• Hydrothermal synthesis
• manganese
• noncentrosymmetric structure
• coordination polymer

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This project was supported by the Liaoning Provincial Education Department (No. L2015299).