Polynuclear Cu(I) and Ag(I) phosphine complexes containing multi-dentate polytopic ligands: Syntheses, crystal structures and photoluminescence properties

Jing XIANG, Shun-Cheung CHENG, Xin-Xin JIN, Qian-Qian SU, Xin ZHOU, Wing-Kin CHU, Chi Fai LEUNG, Chi-Chiu KO

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Abstract

A series of polynuclear metal complexes, [Cu₂(L¹)(PPh₃)₄](ClO₄)₂ (1), [Cu₃(L²)(PPh₃)₆](ClO₄) (2), [Cu₃(L³)(PPh₃)₆] (3), [Ag₂(L¹)(PPh₃)₄](BF₄)₂ (4), [Ag₄(L²)₂(PPh₃)₆] (5) and [Ag₃(L³)(PPh₃)₅] (6), have been obtained from the reactions of the highly conjugated bridging ligands 2,3-bis(2-pyridyl)pyrazine (L¹), 2,3-bis(2-tetrazoyl)pyrazine (H₂L²) and 2,3-bis(2-tetrazoyl)imidazole (H₃L³) with [Cu(MeCN)₄]ClO₄ and AgBF₄, respectively. Their crystal structures have been determined by X-ray crystallography and their photophysical properties have been investigated in detail. Complexes 1 and 3 show photoluminescence in CH₂Cl₂ solution, while all the complexes exhibit obvious luminescence in the solid state; detailed photophysical studies and density functional theory calculations of these complexes have revealed that their lowest energy absorptions and emissions are predominantly derived from either metal-to-ligand charge-transfer (MLCT) or intraligand (IL) excited states. Copyright © 2018 The Royal Society of Chemistry.
Original languageEnglish
Pages (from-to)741-750
JournalDalton Transactions
Volume48
Issue number2
Early online dateDec 2018
DOIs
Publication statusPublished - 2019

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phosphine
Pyrazines
Photoluminescence
Crystal structure
Ligands
X ray crystallography
Coordination Complexes
Energy absorption
Excited states
Density functional theory
Charge transfer
Luminescence
Metals

Bibliographical note

Xiang, J., Cheng, S.-C., Jin, X.-X., Su, Q.-Q., Zhou, X., Chu, W.-K., . . . Ko, C.-C. (2019). Polynuclear Cu(I) and Ag(I) phosphine complexes containing multi-dentate polytopic ligands: Syntheses, crystal structures and photoluminescence properties. Dalton Transactions, 48(2), 741-750. doi: 10.1039/C8DT03377C