Abstrakti
Reactions of the {AuC2R}(n) polymer (R = -C6H4NO2, -C6H5, -C6H4Ph, -C6H4OMe, -C6H4NMe2, -C(OH) Me-2, -C6H10(OH)) with stoichiometric amount of 1,4-bis(diphenylphosphino) butane and Cu(I) ions afford the dicationic complexes of general formula [Au6Cu2(C-2-R)(6)(PPh2(CH2)(4)PPh2)(3)](PF6)(2). The compounds obtained (1-7) display common "rods-in-belt" structural motif with the "Cu-2{Au(C2R)(2)}(3)" central cluster core wrapped about by the {Au-3(Ph2P(CH2)(4)PPh2)(3)} belt. This structural pattern was revealed in solid state by X-ray crystallography and confirmed in solution using the NMR spectroscopy. The complexes 6 and 7 containing hydroxyl substituents in the alkynyl ligands demonstrate structural distortions due to hydrogen bonding inside the cluster core. All complexes studied exhibit intense phosphorescence in dichloromethane solution, the characteristics of which depend on donor ability of the alkynyl ligand substituents. Comparison of the emission wavelengths in 1-7 with those observed in the congeners based on the aromatic diphosphine (PPh2C6H4PPh2) showed considerable blue shift of the emission band maxima in the complexes under study. The theoretical DFT calculations indicated that the triplet emission in 1-7 is mainly determined by electron transitions inside the cluster core with some admixture of MLCT character, the contribution of which plays more important role compared to the analogs with aromatic diphosphine and causes the observed hypsochromic shift of emission. (C) 2012 Elsevier B. V. All rights reserved.
| Alkuperäiskieli | Englanti |
|---|---|
| Sivut | 65-71 |
| Sivumäärä | 7 |
| Julkaisu | Journal of Organometallic Chemistry |
| Vuosikerta | 723 |
| DOI - pysyväislinkit | |
| Tila | Julkaistu - 1 tammik. 2013 |
| OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Rahoitus
Financial support from Saint-Petersburg State University research grant 12.37.132.2011, the Academy of Finland (grant 138560/2010, A.J.K.), University of Eastern Finland (Russian-Finnish collaborative project), and Russian Foundation for Basic Research (grant 11-03-00974-a) is gratefully acknowledged. The work was performed using scientific equipment of the Center of Shared Usage "The analytical center of nano- and biotechnologies of SPbSPU" with financial support of the Ministry of Education and Science of the Russian Federation. XRD study is carried out in the X-ray Diffraction Centre of St. Petersburg State University.
Sormenjälki
Sukella tutkimusaiheisiin 'Synthesis, characterization and photophysical properties of gold(I)-copper(I) alkynyl clusters with 1,4-bis(diphenylphosphino)butane, effect of the diphosphine ligand on luminescence characteristics'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.Siteeraa tätä
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