Synergetic Spin-Crossover and Luminescent Properties in a Multifunctional 2D Iron(II) Coordination Polymer

Jia Wang; Ming Kong; Xiao-Jiao Song; Yu Jing; Yue Zhao; You Song

doi:10.1021/acs.inorgchem.2c03350

Synergetic Spin-Crossover and Luminescent Properties in a Multifunctional 2D Iron(II) Coordination Polymer

Inorg Chem. 2022 Dec 26;61(51):20923-20930. doi: 10.1021/acs.inorgchem.2c03350. Epub 2022 Dec 12.

Authors

Jia Wang¹, Ming Kong¹, Xiao-Jiao Song^{1

2}, Yu Jing¹, Yue Zhao¹, You Song¹

Affiliations

¹ State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing210023, P. R. China.
² Key Laboratory of National Forestry and Grassland Administration on Wildlife Evidence Technology, School of Criminal Science and Technology, Nanjing Forest Police College, Nanjing210023, P. R. China.

PMID: 36510686
DOI: 10.1021/acs.inorgchem.2c03350

Abstract

We designed and synthesized a strong fluorescent tetradentate pyridine ligand, 3,6,11,12-tetra(pyridin-4-yl)dibenzo[a,c]phenazine (TPDP), by covalently grafting pyridyl to fluorescent dye dbpz, which can react with the Fe(NCX)₂ (X = S and Se) unit, obtaining two new 2D [4 × 4] square-grid compounds, namely, {Fe^II(TPDP)₂(SCN)₂·CHCl₃·4CH₃OH}_n (1) and {[Fe^II(TPDP)₂(SeCN)₂]·CH₂Cl₂·4CH₃OH}_n (2). Both of them show expected one-step spin-crossover (SCO) properties, and complex 2^vacuum exhibits a combination of the SCO phenomenon and fluorescence in a synergetic way. The energy transfer mechanism of 2^vacuum is verified by the theoretical calculations and experimental results. This study provides an effective strategy to synthesize large conjugated fluorescent ligands using dyes to further form SCO-luminescent bifunctional materials.