Linkage of [Cr(aet) 3 ] or [Cr( D -pen- N , O , S ) 2 − Octahedral Units by Forming S-Bridged Structures with AG I or Au I Ions (aet=2-aminoethanethiolate, D -pen= D -penicillaminate)

Abstract

The reaction of [Cr(aet) 3 ] (aet=2-aminoethanethiolate) with Ag I in water gave an S-bridged Cr III 2 Ag 3 I pentanuclear complex [Ag 3 {Cr(aet) 3 } 2 ] 3+ ([1] 3+ ). The crystal structure of [1](NO 3 ) 3 2H 2 O was determined by X-ray analysis, which established that two fac ( S )-[Cr(aet) 3 ] units are linked by three Ag I ions through S atoms (average Cr-S=2.387(5), Ag-S= 2.403(5) Å). The three Ag I ions in [ 1 3+ were replaced by Au I ions to form the corresponding Cr 2 III Au 3 I pentanuclear complex [Au 3 {Cr(aet) 3 } 2 ] 3+ ([ 2 ] 3+ ). Treatment of [Cr( D -pen- N, O, S ) 2 ] m ( D -pen= D -penicillaminate) with Ag I in water produced an S-bridged Cr 3 III Ag 3 I hexanuclear complex [Ag 3 {Cr( D -pen- N, O, S ) 2 } 3 ] ([ 3 ]), which has a cyclic structure composed of three trans ( O )-[Cr( D -pen- N, O, S ) 2 ] m units. Variable-temperature magnetic susceptibility data indicated the weak antiferromagnetic interaction for [ 1 3+ ] ( J = m 0.84 cm m 1 ) while the very weak ferromagnetic interaction for [ 3 ] ( J =0.05 cm m 1 ). chromium(III) silver(I) gold(I) S-bridge