title: Self-assembly, structures, and photophysical properties of 4,4'-bipyrazolate-linked metallo-macrocycles with dimetal clips.
abstract: By employing functional diimine ligands coordinated dipalladium(II,II) or diplatinum(II,II) clips as corners and the coplanar 4,4'-bipyrazolate dianion (L(2-)) ligand as linker, a series of bipyrazolate-bridged metallo-macrocycles, namely, [M8L4](NO3)8 (M = Pd(dmbpy), 1; Pd(bpy), 2; Pt(bpy), 3a; Pd(phen), 4; Pt(phen), 5; Pd(15-crown-5-phen), 6; Pd(18-crown-6-phen), 8; Pd(benzo-24-crown-8-phen), 10a; Pt(15-crown-5-phen), 7a, Pt(18-crown-6-phen), 9a; Pt(benzo-24-crown-8-phen), 11a) and [M6L3](NO3)6 (M = Pt(bpy), 3b; Pt(15-crown-5-phen), 7b; Pt(18-crown-6-phen), 9b; Pd(benzo-24-crown-8-phen), 10b; Pt(benzo-24-crown-8-phen), 11b), have been synthesized through a directed self-assembly approach that involves spontaneous deprotonation of the 1H-bipyrazolyl ligands in aqueous solution. All these compounds have a crown-shaped cavity that can serve as host to solvent molecules and anions. The structures are characterized by elemental analysis, (1)H and (13)C NMR, ESI-MS, and in the cases of 1a (the BF4(-) salt of 1), 2a (the BF4(-) salt of 2), and 3b by single-crystal X-ray diffraction analysis. Photophysical properties for complexes 1 and 2 are discussed.
authors.affiliation: Laboratory for Self-Assembly Chemistry, Department of Chemistry, Renmin University of China, Beijing 100872, PR China.
authors.forename: Qing-Fu
authors.initials: QF
authors.lastname: Sun
authors.forename: Keith Man-Chung
authors.initials: KM
authors.lastname: Wong
authors.forename: Li-Xia
authors.initials: LX
authors.lastname: Liu
authors.forename: Hai-Ping
authors.initials: HP
authors.lastname: Huang
authors.forename: Shu-Yan
authors.initials: SY
authors.lastname: Yu
authors.forename: Vivian Wing-Wah
authors.initials: VW
authors.lastname: Yam
authors.forename: Yi-Zhi
authors.initials: YZ
authors.lastname: Li
authors.forename: Yuan-Jiang
authors.initials: YJ
authors.lastname: Pan
authors.forename: Kai-Chao
authors.initials: KC
authors.lastname: Yu