Highly Luminescent Octanuclear Au-I-Cu-I Clusters Adopting Two Structural Motifs: The Effect of Aliphatic Alkynyl Ligands

Igor O. Koshevoy*, Chia-Li Lin, Antti J. Karttunen, Janne Jänis, Matti Haukka, Sergey P. Tunik, Pi-Tai Chou, Tapani A. Pakkanen

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu


Reactions of the homoleptic (AuC2R)(n) precursors with stoichiometric amount of diphosphine ligand PPh2C6H4PPh2 ((PP)-P-boolean AND) and Cu+ ions lead to an assembly of a new family of bimetallic clusters [Au6Cu2(C2R)(6)-((PP)-P-boolean AND)(2)](2+) (type I; R=9-fluorenolyl (1), diphenylmethanolyl (2), 2,6-dimethyl-4-heptanolyl (3), 1-cyclohexanolyl (4), Cy (5), tBu (6)). In the case of R=1cyclohexanolyl, a structurally different complex [Au6Cu2(C2C6H11O)(6)((PP)-P-boolean AND)(3)](2+) (7, type II) could be obtained by treatment of 4 with one equivalent of the diphosphine, while for R=isopropanol-yl only the latter type of cluster [Au6Cu2(C2C3H7O)(6)((PP)-P-boolean AND)(3)](2+) (8) was detected. Steric bulkiness of the alkynyl ligands and O center dot center dot center dot H-O hydrogen bonding are suggested to play an important role in stabilizing the type I and type II cluster structural motif, respectively. All the complexes exhibit intense photoluminescence in solution with emission parameters that depending on the geometrical arrangement of the octanuclear metal core. The clusters 1-4 and 6 show single emission band in a blue region (469-488 nm) with maximum quantum yield of 94% (4), while structurally different 7 and 8 emit yellow-orange (590 nm) with unity quantum efficiency. The theoretical DFT calculations of the electronic structures have been carried out to demonstrate that the metal-centered triplet emission within the heterometallic core plays a key role for the observed phosphorescence.

DOI - pysyväislinkit
TilaJulkaistu - lokakuuta 2011
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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