- Neutral gold(I) metallosupramolecular compounds: Synthesis and characterization, photophysical properties, and density functional theory studies
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The reaction of the tris-indole InTREN ligand (L) with different gold phosphine fragments allows the construction of new gold(I) complexes with different geometries depending on the chosen phosphine. A metallodendrimeric structure is obtained when the gold atom is linked to a triphenylphosphine ligand, and neutral gold(I) metallocryptands are constructed when a triphosphine is used. Characterization of the compounds was accomplished by 31P{1H} and 1H NMR, IR, absorption, and fluorescence spectroscopies, electrospray ionization mass spectrometry (ESI-MS(+)), and elemental analysis, and their geometry was optimized using density functional theory (B3LYP). Time-dependent density functional theory (TD-DFT) calculations have been used to assign the lowest energy absorption bands to LMCT N(p, tertiary amine) → Au transitions. Photophysical characterization of the complexes shows strong luminescence in the solid state. The formation of heterobimetallic species has been detected in solution in the presence of equimolar quantities of metal cations, and their structures have been identified by a combination of spectroscopic methods and mass spectrometry.
- Rodriguez, Laura,Lodeiro, Carlos,Lima, Joao Carlos,Crehuet, Ramon
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p. 4952 - 4962
(2009/02/02)
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- Synthesis, characterization and electrochemical studies of the heterometallic diclusters [{Fe2(μ-CO)(CO)6(μ-PPh2)Au}2(d iphosphine)] (diphosphine=dppm, dppip, dppe, dppp)
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Treatment of [(ClAu)2(diphosphine)] {diphosphine=bis(diphenylphosphino)methane (dppm), bis(diphenylphosphino)isopropane (dppip), 1,2-bis(diphenylphosphino)ethane (dppe), 1,3-bis(diphenylphosphino)propane (dppp)} with two equivalents of the anion [Fe2(μ-CO)(CO)6(μ-PPh2)]- in the presence of TlBF4 gives the new heterometallic diclusters [{Fe2(μ-CO)(CO)6(μ-PPh2)Au}2(d iphosphine)] that have been isolated and characterized. Their 31P-NMR spectra show different patterns as a function of the diphosphine ligand. The electrochemical behavior of these compounds has been investigated and compared with that of the mono- [Fe2(μ-CO)(CO)6(μ-PPh2)(μ-AuPPh3)] and tricluster [{Fe2(μ-CO)(CO)6(μ-PPh2)Au}3(t riphos)] derivatives.
- Ferrer, Montserrat,Julia, Anna,Reina, Roser,Rossell, Oriol,Seco, Miquel,De Montauzon, Dominique
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p. 147 - 153
(2007/10/03)
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- The synthesis of palladium-gold and platinum-gold bimetallic complexes based upon tripod tridentate phosphine and arsine ligands
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The planar complexes MLCl2 [M = Pd or Pt; L = MeC(CH2PPh2)3, MeC (CH2AsPh2)3, MeC(CH2AsMe2)3, MeC(CH2SMe)3 or MeC(CH2
- Chiffey, Andrew F.,Evans, John,Levason, William
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p. 1309 - 1314
(2008/10/09)
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- Electrophilic additions of mono-, di- and tri-gold units to the isoelectronic 2- and 2- anions
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The reaction of 2 with or in tetrahydrofuran gives the mixed manganese-gold clusters 3-H)(μ-AuPR3)> (R = Ph (1) or Me (2)) and 23-H)Au>2(μ-diphos)> (diphos = dppe (3) or dppm (4)).The reaction between the same manganese anion and produces 3-H)Au>3(triphos)>3- (5), 3-H)Au>2(triphos)(AuCl)>2- (6) or 3-H)Au>(triphos)(AuCl)2>- (7), depending on the molar ratio of the reagents.Isoelectronic iron-goldcomplexes (3-x)(triphos)(AuCl)x>(3-x)- (x = 0 (8), 1 (9) or 2 (10) were obtained by the reaction of the trinuclear 2- anion with in the appropriate molar ratio.Attempts to obtain mixed manganese-iron-gold clusters resulted in a mixture of compounds, the nature of which has been explained in terms of metal-ligand redistribution processes.Keywords: Gold; Manganese; Iron; Metal-metal bonds; Clusters; Electrophilic addition
- Rossell, Oriol,Seco, Miquel,Segales, Gloria
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p. 225 - 234
(2007/10/03)
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