Circular dichroism spectra of some trigonal-bipyramidal complexes

Endo, Izumi; Horikoshi, Soichiro; Utsuno, Shunji

doi:10.1039/c39810000296

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Inspection of the literature revealed that a few examples of tripodal ligands with chiral arms had been reported. ,− Our objectives in the present study was to conduct a detailed analysis of the conformational behavior of the ligands in the complexes, including the factors that dictate the axial chirality of the complexes.…”

Section: Introductionmentioning

confidence: 99%

Solid State and Solution Characterization of Chiral, Conformationally Mobile Tripodal Ligands

et al. 1998

View full text Add to dashboard Cite

The synthesis of the ligands N,N-bis [(2-pyridyl)methyl]-1-(2-pyridyl)ethanamine (1, R-MeTPA), N,N-bis[(6-phenyl-2-pyridyl)methyl]-1-(2-pyridyl)ethanamine (2, R-MePh 2 TPA), N,N-bis[(2-quinolyl)methyl]-1-(2-pyridyl)ethanamine, (3, R-MeBQPA), and N,N-bis[(2-pyridyl)]methyl(phenyl)(2-pyridyl)methanamine (4, R-PhTPA) is described. The ligands form chiral, pseudo C 3 -symmetric complexes with Zn II and Cu II salts that possess an available electrophilic coordination site. X-ray crystallographic structures of the complexes [Zn(R-MeTPA)Cl](ClO 4 ), [Zn(RMeBQPA)Cl](ClO 4 ), and [Zn(R-PhTPA)Cl]( ClO 4 ) show that the spatial arrangement of the three pyridyl groups resembles a propeller whose directional sense is controlled by a substituent on one methylene arm. Chiroptical measurements provide supporting information that the complexes maintain similar structures in solution. Monte Carlo/stochastic dynamics (MC/SD) simulations of the [Zn(L)Cl] + complexes indicate that only two conformers are populated at normal temperatures, suggest the presence of a synchronicity in the movement of the heteroaromatic rings during conformer interconversions, and provide an estimate of the energy difference between the conformers.

show abstract