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Journal articles
Hydrogen bonded networks based on hexarhenium(III) chalcocyanide cluster complexes structural and photophysical characterization
Abstract : Two series of isostructural compounds resulting from the combination of the four-fold hydrogen bond donors bisamidinium cations, namely 1-2H(+) and 2-2H(+), and the anionic chalcocyanide clusters of general formula [Re(6)Qi8(CN)a6](4-) are presented (Q = S or Se; where i and a denote inner and apical position, respectively). 1-2H(+) is built upon two imidazolium groups linked together by a -(CH2)(2)- alkyl chain. 2-2H(+) is built upon two hydroxyamidinium groups linked together via a phenyl group and, in consequence, it exhibits a planar geometry. This ionic association leads to either two or three-dimensional hydrogen-bonded networks in the solid state, as confirmed by X-ray crystallographic analysis. The solid-state structures arise from the recognition between the pendant C[triple bond]N ligands of the cluster cores and the amidinium H-bond donors. The luminescence properties of the compounds are investigated in the solid state by means of steady-state and time-resolved techniques. Results are discussed and compared with those measured for the parent Cs-4[Re(6)Si8(CN)a6] and Cs-4[Re(6)Sei8(CN)a6] species. The H-bonded networks display featureless deep-red emission bands centered at (em) = 722 and 737 nm and average excited-state lifetimes ranging between 11.5 and 14.8 s, in accordance with the triplet nature of the radiative process. These photoluminescence properties are similar to the Cs+ homologues and are attributed to the [Re(6)Qi8](2+) emitting core.
Cited literature [68 references]
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01861410
Contributor : Laurent Jonchère <>
Submitted on : Friday, September 14, 2018 - 11:08:29 AM
Last modification on : Wednesday, May 6, 2020 - 8:48:02 AM
Document(s) archivé(s) le : Saturday, December 15, 2018 - 3:49:22 PM
Contributor : Laurent Jonchère <>
Submitted on : Friday, September 14, 2018 - 11:08:29 AM
Last modification on : Wednesday, May 6, 2020 - 8:48:02 AM
Document(s) archivé(s) le : Saturday, December 15, 2018 - 3:49:22 PM
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