title: Structural variations in novel silver(I) complexes with bitopic pyrazole/n-heterocyclic carbene ligands.
abstract: The synthesis and structural characterization of several new silver complexes of L (L = a bidendate ligand of pyrazole and N-heterocyclic carbene) are described. The result shows that the choice of counterions, N-substitutions of L, and reaction conditions are crucial which lead to a variety of structural motifs, including novel metallomacrocycles [Ag2(mu-L)2]2+ with or without Ag...Ag close contact, a mononuclear [AgL2]+ complex, and a [LAg(NO3)]n coordination polymer. In particular, the nonbonding Ag...Ag distance and the overall geometry of the metallomacrocycles are controllable with different N-substitutions and counterions. All these complexes have been determined by X-ray diffraction. The solid-state aggregates are retained in solution as supported by the electrospray mass spectroscopic studies.
authors.affiliation: Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 50058.
authors.forename: Pei Ling
authors.initials: PL
authors.lastname: Chiu
authors.forename: Chih Yuan
authors.initials: CY
authors.lastname: Chen
authors.forename: Chun-Chin
authors.initials: CC
authors.lastname: Lee
authors.forename: Meng-Hua
authors.initials: MH
authors.lastname: Hsieh
authors.forename: Chuan-Hung
authors.initials: CH
authors.lastname: Chuang
authors.forename: Hon Man
authors.initials: HM
authors.lastname: Lee