Heterobimetallic molecular species can produce unique optical, catalytic, and electronic properties. For example, gold-silver clusters have been synthesized and found to be highly efficient optical materials which possess enhanced Non-Linear Optical activity (NLO) over that of the pure silver and gold complexes. This paper describes a successful approach to the synthesis of organic solvent soluble mixed-metal gold-silver compounds with 2:1 and 1:2 Au:Ag ratios. Trinuclear mixed-metal gold-silver compounds are obtained by the reaction of gold(I) carbeniate [Au(μ-C(OEt)=NC6H4-p-CH3)]3, TR(carb), with silver(I) pyrazolate [Ag(μ-3,5-Ph2pz)]3. The crystalline products are mixed-ligand, mixed-metal dimeric products [Au(carb)Ag2(μ-3,5-Ph2pz)2], [Au2(carb)2Ag(μ-3,5-Ph2pz)]•CH2Cl2. They have been characterized by elemental analysis and 1H NMR and mass spectrometry. The X-ray structure of [Au(carb)Ag2(μ-3,5-Ph2pz)2] shows it to be a dimer with two Ag•••Au contacts between the trinuclear units of 3.083(2) and 3.310(2) Å and with average intramolecular Ag•••Ag and Au•••Ag distances of ~ 3.3 and 3.2 Å, respectively. The structure of [Au2(carb)2Ag(μ-3,5-Ph2pz)]•CH2Cl2 is a dimer with one intermolecular Au•••Au attraction of 3.3354(10) Å and a short Ag•••Au distance of ~3.42 Å and intramolecular Ag•••Au and Au•••Au contacts of ~3.2 and ~ 3.3 Å, respectively. Packing diagrams of both complexes show that the dimeric units are independent, similar to their parent molecules. The white powders of these mixed-metal gold-silver compounds show a strong green luminescence under UV excitation at room temperature and a yellow luminescence at 77 K, a luminescence thermochromism.

Mixed-Metal Triangular Trinuclear Complexes: Dimers of Gold-Silver Mixed-Metal Complexes from Gold(I) Carbeniates and Silver(I) 3,5-Diphenylpyrazolates.

BURINI, Alfredo;
2005-01-01

Abstract

Heterobimetallic molecular species can produce unique optical, catalytic, and electronic properties. For example, gold-silver clusters have been synthesized and found to be highly efficient optical materials which possess enhanced Non-Linear Optical activity (NLO) over that of the pure silver and gold complexes. This paper describes a successful approach to the synthesis of organic solvent soluble mixed-metal gold-silver compounds with 2:1 and 1:2 Au:Ag ratios. Trinuclear mixed-metal gold-silver compounds are obtained by the reaction of gold(I) carbeniate [Au(μ-C(OEt)=NC6H4-p-CH3)]3, TR(carb), with silver(I) pyrazolate [Ag(μ-3,5-Ph2pz)]3. The crystalline products are mixed-ligand, mixed-metal dimeric products [Au(carb)Ag2(μ-3,5-Ph2pz)2], [Au2(carb)2Ag(μ-3,5-Ph2pz)]•CH2Cl2. They have been characterized by elemental analysis and 1H NMR and mass spectrometry. The X-ray structure of [Au(carb)Ag2(μ-3,5-Ph2pz)2] shows it to be a dimer with two Ag•••Au contacts between the trinuclear units of 3.083(2) and 3.310(2) Å and with average intramolecular Ag•••Ag and Au•••Ag distances of ~ 3.3 and 3.2 Å, respectively. The structure of [Au2(carb)2Ag(μ-3,5-Ph2pz)]•CH2Cl2 is a dimer with one intermolecular Au•••Au attraction of 3.3354(10) Å and a short Ag•••Au distance of ~3.42 Å and intramolecular Ag•••Au and Au•••Au contacts of ~3.2 and ~ 3.3 Å, respectively. Packing diagrams of both complexes show that the dimeric units are independent, similar to their parent molecules. The white powders of these mixed-metal gold-silver compounds show a strong green luminescence under UV excitation at room temperature and a yellow luminescence at 77 K, a luminescence thermochromism.
2005
262
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/226487
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact