Jump to main content
Jump to site search

Issue 54, 2005

Homochiral 1D-helical metal–organic frameworks from achiral components. Formation of chiral channel via C–H⋯Cl interaction

Author affiliations

Abstract

Using an achiral ligand α,α′-bis(pyrazolyl)-m-xylene (L6) a coordination polymer [(L6)ZnIICl2]1 (1a and 1b are two enantiomorphs) has been prepared and authenticated from their crystal structure determination. Structural analysis revealed that each Zn(II) centre is coordinated by two chloride ions and two pyrazole nitrogens from two different L6 ligands, giving pseudo-tetrahedral coordination environment around a metal ion. For these structures 1-D homochiral helical polymeric chain running along a crystallographic 21 axis in the b-direction is observed. In continuation of our recent activity on inorganic crystal engineering from the standpoint of metal–ligand coordination chemistry and C–H⋯Cl2MII hydrogen bonding, in this work we have investigated the potential of coordination modules present in 1a and 1b in bringing about generality of homochiral helix formation, strengthened by C–H⋯Cl interactions. Notably, in the case of 1 both right-(P) (1a) and left-(M) (1b) handed helices from two different crystals from same batch were identified. This work demonstrates a case of conglomeration (racemic mixture of chiral crystals). Helical channels are formed via noncovalent C–H⋯Cl hydrogen-bonding supported by π–π interactions.

Graphical abstract: Homochiral 1D-helical metal–organic frameworks from achiral components. Formation of chiral channel via C–H⋯Cl interaction

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Mar 2005, accepted on 28 Apr 2005 and first published on 05 May 2005


Article type: Paper
DOI: 10.1039/B503583J
CrystEngComm, 2005,7, 337-341

  •   Request permissions

    Homochiral 1D-helical metal–organic frameworks from achiral components. Formation of chiral channel via C–H⋯Cl interaction

    V. Balamurugan and R. Mukherjee, CrystEngComm, 2005, 7, 337
    DOI: 10.1039/B503583J

Search articles by author

Spotlight

Advertisements