title: Multimetallic arrays: bi-, tri-, tetra-, and hexametallic complexes based on gold(I) and gold(III) and the surface functionalization of gold nanoparticles with transition metals.
abstract: Reaction of [AuCl(PPh(3))] with the zwitterion S(2)CNC(4)H(8)NH(2) yields [(Ph(3)P)Au(S(2)CNC(4)H(8)NH(2))]BF(4). Treatment of this species with NEt(3) and CS(2) followed by [AuCl(PPh(3))] leads to [{(Ph(3)P)Au}(2)(S(2)CNC(4)H(8)NCS(2))], which can also be obtained directly from [AuCl(PPh(3))] and KS(2)CNC(4)H(8)NCS(2)K. A heterobimetallic variant, [(dppm)(2)Ru(S(2)CNC(4)H(8)NCS(2))Au(PPh(3))](+), can be prepared by the sequential reaction of [(dppm)(2)Ru(S(2)CNC(4)H(8)NH(2))](2+) with NEt(3) and CS(2) followed by [AuCl(PPh(3))]. Reaction of the same ruthenium precursor with [(dppm)(AuCl)(2)] under similar conditions yields the trimetallic complex [(dppm)(2)Ru(S(2)CNC(4)H(8)NCS(2))Au(2)(dppm)](2+). Attempts to prepare the compound [(dppm)Au(2)(S(2)CNC(4)H(8)NH(2))](2+) from [(dppm)(AuCl)(2)] led to isolation of the known complex [{(dppm)Au(2)}(2)(S(2)CNC(4)H(8)NCS(2))](2+) via a symmetrization pathway. [{(dppf)Au(2)}(2)(S(2)CNC(4)H(8)NCS(2))](2+) was successfully prepared from [(dppf)(AuCl)(2)] and crystallographically characterized. In addition, a gold(III) trimetallic compound, [{(dppm)(2)Ru(S(2)CNC(4)H(8)NCS(2))}(2)Au](3+), and a tetrametallic gold(I) species, [{(dppm)(2)Ru(S(2)CNC(4)H(8)NCS(2))Au}(2)](2+), were also synthesized. This methodology was further exploited to attach the zwitterionic (dppm)(2)Ru(S(2)CNC(4)H(8)NCS(2)) unit to the surface of gold nanoparticles, which were generated in situ and found to be 3.4 (+/-0.3) and 14.4 (+/-2.5) nm in diameter depending on the method employed. Nanoparticles with a mixed surface topography were also explored.
authors.affiliation: Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK.
authors.forename: Edward R
authors.initials: ER
authors.lastname: Knight
authors.forename: Nina H
authors.initials: NH
authors.lastname: Leung
authors.forename: Amber L
authors.initials: AL
authors.lastname: Thompson
authors.forename: G
authors.initials: G
authors.lastname: Hogarth
authors.forename: James D E T
authors.initials: JD
authors.lastname: Wilton-Ely
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010316:Particle Size; D012428:Ruthenium / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D009942:Organometallic Compounds; D006046:Gold; D012428:Ruthenium