Helical and network coordination polymers based on a novel C2-symmetric ligand : SHG enhancement through specific metal coordinationElectronic supplementary information (ESI) available: experimental, crystallographic and computational details. See http://www.rsc.org/suppdata/cc/b3/b316931f/
Helical and network coordination polymers based on a novel C2-symmetric ligand : SHG enhancement through specific metal coordinationElectronic supplementary information (ESI) available: experimental, crystallographic and computational details. See http://www.rsc.org/suppdata/cc/b3/b316931f/
Helicity of N,N′-diaryl-trans-1,2-diaminocyclohexane derivatives. Implications for molecular helicity manipulations
作者:M Kwit、J Gawronski
DOI:10.1016/j.tet.2003.09.090
日期:2003.11
Derivatives of trans-1,2-diaminocyclohexane (DACH), useful as chiral ligands, scaffolds and building blocks, differ in their conformation. The conformation of N,N'-diaryl-DACH derivatives was studied by the semiempirical and DFT computational methods and by exciton-coupled circular dichroism. It was found that, contrary to M-helical N,A -diimine, N,N'-diimide and N,N'-diamide derivatives, the aromatic residues in N,M-diphenyl derivatives are oriented to form a P-helix for the (R,R)-DACH absolute configuration. The helicity of the bis-aryl system is modified in the case of I-naphthyl or 2-naphthyl derivatives. Further switching of helicity has been demonstrated by either protonation or mono-N-acetylation of N,N'-diaryl DACH derivatives. (C) 2003 Published by Elsevier Ltd.
Helical and network coordination polymers based on a novel C2-symmetric ligand : SHG enhancement through specific metal coordinationElectronic supplementary information (ESI) available: experimental, crystallographic and computational details. See http://www.rsc.org/suppdata/cc/b3/b316931f/
作者:S. Philip Anthony、T. P. Radhakrishnan
DOI:10.1039/b316931f
日期:——
Cu(I) and Ag(I) coordination polymers of an axially chiral “push–pull” ligand possess respectively 2-D network and helical structures and the coordination mode strongly influences the solid state SHG reduction/enhancement with respect to the free ligand.