Solvent-mediated purification of hexa-molybdenum cluster halide, Cs-2[Mo6Cl14] for enhanced optical properties

Abstract : The crystallization of a high-purity hexamolybdenum cluster chloride, Cs-2[Mo6Cl14], was investigated with the aim of improving its intrinsic properties, including optical properties. In particular, we used the hydrophilicities of alcoholic solvents to purify Cs-2[Mo6Cl14] by dehydration. The precursor, trigonal Cs-2[Mo6Cl14] with water impurities, or monoclinic Cs-2[Mo6Cl14]center dot H2O, was dispersed in methanol (MeOH), ethanol (EtOH), or 1-propanol (1-PrOH) to induce recrystallization during stirring. As a result, regardless of the precursor, Cs-2[Mo6Cl14] crystallized from EtOH and 1-PrOH, while Cs-2[Mo6Cl14]center dot H2O crystallized from MeOH, which indicates that EtOH and 1-PrOH behave as dehydrating agents during recrystallization. Subsequent characterization by X-ray diffraction, thermal desorption, and infrared spectroscopic techniques confirmed that the Cs-2[Mo6Cl14] crystallized from EtOH or 1-PrOH, particularly 1-PrOH, is of high purity (fewer inserted water molecules) and high crystallinity. Improved luminescence efficiency following purification was evidenced by time-resolved photoluminescence measurements; the Cs-2[Mo6Cl14] purified by dehydration on recrystallization clearly exhibited an increased luminescence lifetime.
Type de document :
Article dans une revue
CrystEngComm, Royal Society of Chemistry, 2017, 19 (40), pp.6028-6038. 〈10.1039/c7ce01440f〉
Domaine :
Liste complète des métadonnées

https://hal-univ-rennes1.archives-ouvertes.fr/hal-01631919
Contributeur : Laurent Jonchère <>
Soumis le : jeudi 9 novembre 2017 - 17:40:23
Dernière modification le : samedi 24 mars 2018 - 01:35:40

Identifiants

Citation

Norio Saito, Pierric Lemoine, Stéphane Cordier, Yoshiki Wada, Takeo Ohsawa, et al.. Solvent-mediated purification of hexa-molybdenum cluster halide, Cs-2[Mo6Cl14] for enhanced optical properties. CrystEngComm, Royal Society of Chemistry, 2017, 19 (40), pp.6028-6038. 〈10.1039/c7ce01440f〉. 〈hal-01631919〉

Partager

Métriques

Consultations de la notice

58