Synthesis and Metalation of a Chiral, Pyridine-Strapped, Cyclic Bis(benzimidazole) Ligand
摘要:
[GRAPHICS]Synthesis of a chiral, strapped, cyclic bis(benzimidazole) ligand is reported. This compound forms a stable, Jahn-Teller-distorted, octahedral Cu(II) complex in which the elongated axis is positioned within the main macrocycle. The C-2-symmetric bis(benzimidazole) core adopts a highly ruffled conformation with the ortho-substituted benzene rings located anti relative to the pyridine-bearing strap.
Synthesis and Metalation of a Chiral, Pyridine-Strapped, Cyclic Bis(benzimidazole) Ligand
摘要:
[GRAPHICS]Synthesis of a chiral, strapped, cyclic bis(benzimidazole) ligand is reported. This compound forms a stable, Jahn-Teller-distorted, octahedral Cu(II) complex in which the elongated axis is positioned within the main macrocycle. The C-2-symmetric bis(benzimidazole) core adopts a highly ruffled conformation with the ortho-substituted benzene rings located anti relative to the pyridine-bearing strap.
Synthesis and Characterization of the Dimethyl-Substituted Bisbenzimidazole Ligand and Its Manganese Complex
作者:Wai Him Kwok、Huichang Zhang、Pramatha Payra、Maosheng Duan、Shao-ching Hung、Dean H. Johnston、Judith Gallucci、Ewa Skrzypczak-Jankun、Michael K. Chan
DOI:10.1021/ic991322a
日期:2000.5.1
Macrocycles with unique properties provide new avenues for the design of novel catalysts and materials. Here, we report, for the first time, the synthesis and characterization of the dimethyl-substituted bisbenzimidazole ligand (Me2BBZ) and its manganese complex (Mn-Me2BBZ). The Me2BBZ ligand is similar to porphyrin and phthalocyanine macrocycles in terms of its cavity size and metal-binding mode,
Structural, Magnetic and Catalytic Properties of a Self-Recognized μ-Oxo-Bridged Diiron(III) Bis(benzimidazole) Complex
作者:Pramatha Payra、Shao-Ching Hung、Wai Him Kwok、Dean Johnston、Judith Gallucci、Michael K. Chan
DOI:10.1021/ic0013781
日期:2001.7.1
The inherent nonplanarity and C(2) symmetry of the dimethyl-substituted bis(benzimidazole) ligand (Me(2)BBZ) results in two distinct atropisomers that, when separated, have been suggested to have potential for chiral recognition and catalysis. Here is reported the synthesis and characterization of a diiron mu-oxo-bridged bis(benzimidazole) complex, 1, that provides indirect support for this hypothesis
Structural Trends in First-Row Transition-Metal Bis(benzimidazole) Complexes
作者:Pramatha Payra、Huichang Zhang、Wai Him Kwok、Maosheng Duan、Judith Gallucci、Michael K. Chan
DOI:10.1021/ic991075a
日期:2000.3.1
(Me2BBZ) is a novel macrocyclicligand that possesses an intrinsic nonplanarity. To examine how metal-ion binding affects the magnitude of this nonplanarity, we have determined the structures of a periodic series of Me2BBZ complexes bound to Mn(II), Fe(II), Co(II), Ni(II), and Cu(II). These studies demonstrate that the extent of ligand ruffling and metal doming is indeed influenced by the nature of the