Issue 43, 2021

Blue- and white-light-emitting 2D-coordination polymers and their solid-state photodimerization reaction

Abstract

Two Pb(II) coordination polymers (CPs), namely [Pb(μ-bpe)(μ-O2CCH3)2]n (1) and [Pb(μ-bpe)(μ-O2CH)2]n (2), have been isolated from the reaction of Pb(OAc)2·3H2O with 1,2-bis(4-pyridyl)ethene (bpe) in the presence of acetate and formate anionic ligands, respectively. Compounds 1 and 2 formed 2D sheet-like structures, constructed by bridging acetate and formate carboxylate ligands. The bpe ligand containing the olefinic C[double bond, length as m-dash]C bonds was perfectly brought to the proximity of Schmidt topolochemical criteria for 2. The 2D sheet in 2 underwent 67% of the photodimerization reaction in the solid state, while the 2D sheet in 1 was photochemically stable. Therefore, the photochemical reactivity of 1 and 2 was rationalized based on the orientation of the olefinic C[double bond, length as m-dash]C bonds, which was brought close to each other due to the distinct bridging of the carboxylates and the Pb(II) metal ions. The room temperature solid-state photoluminescence (PL) revealed that compound 1 exhibited a near white-light emission and the blue-light emission for 2 upon excitation at 365 nm. The differences in the emission of the two 2D-sheets were correlated with the bridging carboxylate ligands.

Graphical abstract: Blue- and white-light-emitting 2D-coordination polymers and their solid-state photodimerization reaction

Supplementary files

Article information

Article type
Paper
Submitted
28 Jul 2021
Accepted
06 Oct 2021
First published
06 Oct 2021

CrystEngComm, 2021,23, 7663-7670

Blue- and white-light-emitting 2D-coordination polymers and their solid-state photodimerization reaction

A. M. P. Peedikakkal, A. S. Jalilov, A. R. Shaikh, A. N. Kalanthoden and A. A. Al-Saadi, CrystEngComm, 2021, 23, 7663 DOI: 10.1039/D1CE00991E

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