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Your search keyword '"Crespo, Olga"' showing total 11 results
Start Over Author "Crespo, Olga" Journal dalton transactions
11 results on '"Crespo, Olga"'

11. Group 11 complexes with the bis(3,5-dimethylpyrazol-1-yl)methane ligand. How secondary bonds can influence the coordination environment of Ag(i): the role of coordinated water in [Ag2(µ-L)2(OH2)2](OTf)2Dedicated to Prof. Victor Riera on the occasion of his 70th birthday.The HTML version of this article has been enhanced with colour images.

Author

José Calhorda, Maria, Costa, Paulo J., Crespo, Olga, Gimeno, M. Concepción, Jones, Peter G., Laguna, Antonio, Naranjo, Mar, Quintal, Susana, Shi, Yu-Jun, and Villacampa, M. Dolores

Abstract

The complexation properties of the ligand bis(3,5-dimethylpyrazol-1-yl)methane (L) towards group 11 metals have been studied. The reaction in a 1 : 1 molar ratio with [Cu(NCMe)4]PF6or Ag(OTf) complexes gives the mononuclear [CuL(NCMe)]PF6(1), with crystallographic mirror symmetry, or dinuclear [Ag2(µ-L)2](OTf)2(2) (OTf = trifluoromethanesulfonate) in which the ligand bridges both silver centres, an unprecedented mode of coordination for this type of ligands. Compound 2crystallizes with two water molecules and forms a supramolecular structure through classical hydrogen bonding. The reaction in a 2 : 1 ratio affords in both cases the four-coordinated derivatives [ML2]X (M = Cu, X = PF6(3); Ag, X = OTf (4)). The treatment of [Ag(OTf)(PPh3)] with the ligand L gives [AgL(PPh3)]OTf (5). The gold(i) derivative [Au2(C6F5)2(µ-L)] (6) has also been obtained by reaction of L with two equivalents of [Au(C6F5)(tht)]. These complexes present a luminescent behaviour at low temperature; the emissions being mainly intraligand but enhanced after coordination of the metal. Compounds 1–4have been characterized by X-ray crystallography. DFT studies showed that, in the silver complex 2, coordination of H2O to Ag in the binuclear complex is favoured by formation of a hydrogen-bonding network, involving the triflato anion, and releasing enough energy to allow distortion of the Ag2framework.

Published
2006
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