TY - JOUR
T1 - Anion-dependent formation of helicates versus mesocates of triple-stranded M 2L 3 (M = Fe 2+, Cu 2+) complexes
AU - Cui, Fengjuan
AU - Li, Shaoguang
AU - Jia, Chuandong
AU - Mathieson, Jennifer S.
AU - Cronin, Leroy
AU - Yang, Xiao Juan
AU - Wu, Biao
PY - 2012/1/2
Y1 - 2012/1/2
N2 - A series of dinuclear triple-stranded complexes, [Fe 2L 3⊃X]X 6 [X = BF 4 - (1), ClO 4 - (2)], [Fe 2L 3⊃SO 4] 2(SO 4) 5 (3), [Fe 2L 3⊃Br](BPh 4) 6 (4), Fe 2L 3(NO 3)Br 6 (5), and [Cu 2L 3⊃NO 3](NO 3) 6 (6), which incorporate a central cavity to encapsulate different anions, have been synthesized via the self-assembly of iron(II) or copper(II) salts with the N,N′-bis[5-(2,2′-bipyridyl)methyl]imidazolium bromide (LBr) ligand. X-ray crystallographic studies (for 1-4 and 6) and elemental analyses confirmed the cagelike triple-stranded structure. The anionic guest is bound in the cage and shows remarkable influence on the outcome of the self-assembly process with regard to the configuration at the metal centers. The mesocates (with different configurations at the two metal centers) have formed in the presence of large tetrahedral anions, while helicates (with the same configuration at both metal centers) were obtained when using the relatively smaller spherical or trigonal-planar anions Br - or NO 3 -.
AB - A series of dinuclear triple-stranded complexes, [Fe 2L 3⊃X]X 6 [X = BF 4 - (1), ClO 4 - (2)], [Fe 2L 3⊃SO 4] 2(SO 4) 5 (3), [Fe 2L 3⊃Br](BPh 4) 6 (4), Fe 2L 3(NO 3)Br 6 (5), and [Cu 2L 3⊃NO 3](NO 3) 6 (6), which incorporate a central cavity to encapsulate different anions, have been synthesized via the self-assembly of iron(II) or copper(II) salts with the N,N′-bis[5-(2,2′-bipyridyl)methyl]imidazolium bromide (LBr) ligand. X-ray crystallographic studies (for 1-4 and 6) and elemental analyses confirmed the cagelike triple-stranded structure. The anionic guest is bound in the cage and shows remarkable influence on the outcome of the self-assembly process with regard to the configuration at the metal centers. The mesocates (with different configurations at the two metal centers) have formed in the presence of large tetrahedral anions, while helicates (with the same configuration at both metal centers) were obtained when using the relatively smaller spherical or trigonal-planar anions Br - or NO 3 -.
UR - http://www.scopus.com/inward/record.url?scp=84855400845&partnerID=8YFLogxK
U2 - 10.1021/ic201417y
DO - 10.1021/ic201417y
M3 - Article
AN - SCOPUS:84855400845
SN - 0020-1669
VL - 51
SP - 179
EP - 187
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 1
ER -