Linked Life Data

18939822

Source:http://linkedlifedata.com/resource/pubmed/id/18939822

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
2008-11-12
pubmed:abstractText
Reaction of polymeric gold(I) acetylide species (bpyC[triple bond]CAu)n (bpyC[triple bond]CH = 5-ethynyl-2,2'-bipyridine) with diphosphine ligands Ph2P(CH2)nPPh2 (n = 2-6) or 1,1'-bis(diphenylphosphino)-ferrocene (dppf) in dichloromethane induces isolation of binuclear gold(I) complexes (bpyC[triple bond]CAu)2{mu-Ph2P(CH2)nPPh2} or (bpyC[triple bond]CAu)2(mu-dppf). Complexation of Ln(hfac)3 (hfac = hexafluoroacetylacetonate, Ln = Nd, Eu, Er, Yb) subunits to the binuclear gold(I) complexes through 2,2'-bipyridyl chelation gives the corresponding Au4Ln4 or Au2Ln2 heteropolynuclear complexes. Noticeably, upon formation of the Au4Ln4 arrays by complexation of (bpyC[triple bond]CAu)2(mu-Ph2P(CH2)4PPh2) (3) with Ln(hfac)3 units, trans-conformation in 3 transforms dramatically to the cis-arranged form due to the strong driving force from ligand-unsupported Au-Au contacts between two Au2Ln2 subunits. In contrast, cis-conformation in (bpyC[triple bond]CAu)2(mu-dppf) (6) stabilized by Au-Au interactions is reversed to the trans-oriented form upon formation of Au2Ln2 arrays by introducing Ln(hfac)3 units through 2,2-bipyridyl chelation. The binuclear gold(I) complexes show bright blue luminescence featured by ligand-centered pi --> pi* (C[triple bond]Cbpy) states together with low-energy emission at 500-540 nm, associated with 3(pi-->pi*) excited states, mixed probably with some characteristic from (Au-Au) --> (C[triple bond]Cbpy) 3MMLCT transition. For Au4Ln4 or Au2Ln2 complexes, sensitized lanthanide luminescence is achieved by energy transfer from Au-acetylide chromophores with lifetimes in the sub-millisecond range for EuIII complexes, whereas in the microsecond range for near-infrared emitting NdIII, ErIII, and YbIII species.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
1520-510X
pubmed:author
pubmed:issnType
Electronic
pubmed:day
17
pubmed:volume
47
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
10744-52
pubmed:dateRevised
2010-6-1
pubmed:meshHeading
pubmed-meshheading:18939822-2,2'-Dipyridyl, pubmed-meshheading:18939822-Alkynes, pubmed-meshheading:18939822-Ferrous Compounds, pubmed-meshheading:18939822-Gold, pubmed-meshheading:18939822-Lanthanoid Series Elements, pubmed-meshheading:18939822-Luminescence, pubmed-meshheading:18939822-Luminescent Measurements, pubmed-meshheading:18939822-Magnetic Resonance Spectroscopy, pubmed-meshheading:18939822-Molecular Conformation, pubmed-meshheading:18939822-Molecular Structure, pubmed-meshheading:18939822-Organometallic Compounds, pubmed-meshheading:18939822-Phosphines, pubmed-meshheading:18939822-Spectrometry, Mass, Electrospray Ionization, pubmed-meshheading:18939822-Spectrophotometry, Infrared, pubmed-meshheading:18939822-Spectrophotometry, Ultraviolet, pubmed-meshheading:18939822-X-Ray Diffraction
pubmed:year
2008
pubmed:articleTitle
Conformation changes and luminescent properties of Au-Ln (Ln = Nd, Eu, Er, Yb) arrays with 5-ethynyl-2,2'-bipyridine.
pubmed:affiliation
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't