| Title: | Vapochromic behavior of Ag2(Et2O)2[Au(C6F5)2]2n with volatile organic compounds |
| Author(s): | Fernandez EJ; Lopez-de-Luzuriaga JM; Monge M; Olmos ME; Puelles RC; Laguna A; Mohamed AA; Fackler JP; |
| Address: | "Departamento de Quimica, Universidad de La Rioja, Grupo de Sintesis Quimica de La Rioja, UA-CSIC, Madre de Dios 51, E-26004 Logrono, Spain" |
| ISSN/ISBN: | 1520-510X (Electronic) 0020-1669 (Linking) |
| Abstract: | "The vapochromic behaviors of Ag2L2[Au(C6F5)2]2n (L = Et2O (1), Me2CO (2), THF (3), CH3CN (4)) were studied. Ag2L2[Au(C6F5)2]2n (L = Et2O (1)) was synthesized by the reaction of [Bu4N][Au(C6F5)2] with AgOClO3 in 1:1 molar ratio in CH2Cl2/Et2O (1:2). 1 was used as starting material with THF to form Ag2L2[Au(C6F5)2]2n (L = THF (3)). 3 crystallizes in the monoclinic space group C2/c and consists of tetranuclear units linked together via aurophilic contacts resulting in the formation of a 1D polymer that runs parallel to the crystallographic z axis. The gold(I) atoms are linearly coordinated to two pentafluorophenyl groups and display additional Au...Ag close contacts within the tetranuclear units with distances of 2.7582(3) and 2.7709(3) A. Each silver(I) center is bonded to the two oxygen atoms of the THF molecules with a Ag-O bond distance of 2.307(3) A. TGA analysis showed that 1 loses two molecules of the coordinated solvent per molecular unit (1st one: 75-100 degrees, second one: 150-175 degrees C), whereas 2, 3, and 4 lose both volatile organic compounds (VOCs) and fluorinated ligands in a less well defined manner. Each complex loses both the fluorinated ligands and the VOCs by a temperature of about 325 degrees C to give a 1:1 gold/silver product. X-ray powder diffraction studies confirm that the reaction of vapors of VOCs with 1 in the solid state produce complete substitution of the ether molecules by the new VOC. The VOCs are replaced in the order CH3CN > Me2CO > THF > Et2O, with the ether being the easiest to replace. Ag2(Et2O)2[Au(C6F5)2]2n and Ag2(THF)2[Au(C6F5)2]2 n both luminesce at room temperature and at 77 K in the solid state. Emission maxima are independent of the excitation wavelength used below about 500 nm. Emission maxima are obtained at 585 nm (ether) and 544 nm (THF) at room temperature and at 605 nm (ether) and 567 nm (THF) at 77 K" |
| Notes: | "PubMed-not-MEDLINEFernandez, Eduardo J Lopez-de-Luzuriaga, Jose M Monge, Miguel Olmos, M Elena Puelles, Raquel C Laguna, Antonio Mohamed, Ahmed A Fackler, John P Jr eng 2008/08/13 Inorg Chem. 2008 Sep 15; 47(18):8069-76. doi: 10.1021/ic800452w. Epub 2008 Aug 9" |
