title: Synthesis and X-ray structures of silver and gold guanidinate-like complexes. A Au(II) complex with a 2.47 A Au-Au distance.
abstract: The structures of the tetranuclear silver(I), [Ag4(hpp)4], and the dinuclear gold(II), [Au2(hpp)2Cl2], (hpp = 1,3,4,6,7,8-hexahydro-pyrimido[1,2-a]pyrimidinate) guanidinate-like bases are reported and show a silver-silver distance of 2.8614(6) A and a gold-gold distance of 2.4752(9) A, the shortest Au-Au bond heretofore reported.
authors.affiliation: Laboratory for Molecular Structure and Bonding, Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA.
authors.forename: Michael D
authors.initials: MD
authors.lastname: Irwin
authors.forename: Hanan E
authors.initials: HE
authors.lastname: Abdou
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Mohamed
authors.forename: John P
authors.initials: JP
authors.lastname: Fackler