The Intrinsic3[dσ*pσ] Emission of Binuclear Gold(I) Complexes with Two Bridging Diphosphane Ligands Lies in the Near UV; Emissions in the Visible Region Are Due to Exciplexes

Fu, Wen‐Fu; Chan, Kwok-Chu; Miskowski, Vincent M.; Che, Chi‐Ming

doi:10.1002/(sici)1521-3773(19990917)38:18<2783::aid-anie2783>3.0.co;2-i

Cited by 153 publications

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“…One example of the highest nuclearity obtained is the hypervalent complex [Au 6 (m-C)(PPh 3 ) 6 ] 2þ whose structure has been determined by X-ray crystallography [89]. This compound has been studied by 252 Cf plasma desorption mass spectrometry [90]. Analogous hexaaurated complexes have also been synthesized with different diphosphines and monophosphines.…”

Section: Clustering Of Gold Atoms At One Centermentioning

confidence: 99%

“…Substrate-binding reactions of the 3[dsÃps] excited state of [Au 2 (dcpm) 2 ] 2þ derivatives (dcpm ¼ bis(dicyclohexylphosphino)methane) have been carried out [252,253] and the electroluminescence (EL) from the triplet state of [Au 2 (dppm) 2 ](SO 3 CF 3 ) 2 has been reported [254]. The synthesis of the water soluble [Au 2 (hmpe) 2 ]Cl 2 has been afforded from reaction of [AuCl(PPh 3 )] and the diphosphine in dichloromethane/ water media, whereas the reaction of Na[AuCl 4 ] and hmpe in water affords the homoleptic mononuclear derivative [Au(hmpe) 2 ]Cl.…”

Section: Complexes With Bridging Bidentate Ligandsmentioning

confidence: 99%

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Gold–Gold Interactions

Crespo

2008

Modern Supramolecular Gold Chemistry

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This chapter focuses mainly on closed shell gold(I) atoms which are found to feel attraction among themselves. This attraction is able to modify expected geometries or support one-, two-or three-dimensional arrays and also leads to interesting properties. Closed shell metal cations are expected to repel each other. Nevertheless, an important number of examples containing [d 8 -d 10 -s 2 ] interactions are known. Particularly strong evidence has been accumulated on the attraction between two or more d 10 shells. In the case of gold(I) such attraction between two or more monovalent gold(I) ions in compounds has been observed structurally for a long time. In these situations the gold centers approach each other to a distance of between 2.7 and 3.3 Å. This range includes the distance between gold atoms in gold metal and approaches, or even overlaps with the range of distances found in the few real Au-Au single bonds. Schmidbaur coined the name aurophilic attraction in 1990 and defined it as the unprecedented affinity between gold atoms even with closed-shell electronic configurations and equivalent electrical charges [1]. Since that moment, aurophilicity has become one of the hot topics in gold chemistry, at first with the aim of understanding such interaction, more recently because of the observation that it may play an important role in interesting properties, thus understanding and modulating aurophilic interactions could help to govern these properties, which include the optical behavior. Although different origins are possible for the luminescent emissions of coordination complexes, such as intraligand transitions (ILT), ligand to metal or metal to ligand charge transfer transitions (LMCT, MLCT) and metal centered (MCT) transitions, in many luminescent gold complexes the emissions have been related to the presence of aurophilic interactions.Information about aurophilicity and chemical situations in which it is observed may be found in different works that may be classified as those which analyse closed shell interactions in general [2], those focused on aurophilicity [1,3], and others which analyze the role of these interactions in coordination [4] and organometallic gold Modern Supramolecular Gold Chemistry: Gold-Metal Interactions and Applications. Edited by Antonio Laguna

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Section: Clustering Of Gold Atoms At One Centermentioning

confidence: 99%

Section: Complexes With Bridging Bidentate Ligandsmentioning

confidence: 99%

Gold–Gold Interactions

Crespo

2008

Modern Supramolecular Gold Chemistry

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“…Besides the extensive use for biological labeling [6][7][8] and their ability to promote surface enhanced spectral phenomena [9][10][11], it was discovered that noble metal nanoparticles display intense light emission and it is expected to yield new insights into the practical applications in optical devices and in biology. In the case of silver, it was reported that neutral nanoparticles emit light in rare gas matrix at cryogenic temperature under photoactivation or electroactivation, and this photoluminescence was attributed to sp to sp-like transitions, analogous to intraband transitions in bulk silver [12][13][14]. Besides, some observations had been attributed to photoreduction processes at the interface between metallic silver and silver oxide [15,16], and other investigations carried out in solid-state materials assigned the luminescence to be from charged silver congeries [17,18].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence from colloidal silver nanoparticles

Zhang

Fang

2008

Journal of Luminescence

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“…They can be homo-or hetero-nuclear compounds, for which excellent reviews have been published recently (57). The nuclearity of structurally characterised homonuclear clusters goes from 4 (some examples of tetra-, as [Au4{(PPh2)2C2B9H10}2L2] (37), or hexa-nuclear complexes, as [(H12B10Au)(μ-AuPEt3)4(AuB10H12)] (38) are collected in box 12 (69)) to 39, as the complex [Au39Cl6(PPh3)14]Cl2 (39), which has a structure related to a hexagonal packed geometry with a 1:9:9:1:9:9:1 individual layers of gold atoms (box 12) (70).…”

Section: Clusters and Gold(0) Complexesmentioning

confidence: 99%