[1,4-Bis(pyridyl-2-ylmethyl)-1,4-diazacycloheptane]chlorocobalt(II) perchlorate

Using a group of six neutral M(II)Cl(2)-containing coordination compounds as building blocks, the first systematic investigation of C-H...Cl hydrogen-bonding interactions was performed. Single-crystal X-ray structural analyses of four new compounds (pseudo-tetrahedral Co(II) and Zn(II); distorted trigonal bipyramidal Zn(II)) authenticate the metal coordination geometry. To provide a unified view of the presence of noncovalent interactions in this class of compounds, we have re-examined the packing diagram of two previously reported compounds (a distorted square-pyramidal Cu(II) complex and a trans-octahedral Co(II) complex). The organic ligands of our choice comprise bidentate/tridentate pyrazolylmethylpyridines and an unsymmetrical tridentate pyridylalkylamine. This systematic investigation has allowed us to demonstrate the existence of versatile C-H...Cl(2)M interactions and to report the successful application of such units as inorganic supramolecular synthons. Additional noncovalent interactions such as C-H...O and O-H...Cl hydrogen bonding and pi-pi stacking interactions have also been identified. Formation of novel supramolecular architectures has been revealed: 2D lamellar (p-cyclophane) and 3D lamellar, 3D "stitched staircase" (due to additional hydrogen-bonding interactions by water tetramers, with an average O-O bond length in the tetramer unit of 2.926 A, acting as "molecular clips" between staircases), 3D linked ladder, and single-stranded 1D helix.

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First Systematic Investigation of CH⋅⋅⋅Cl Hydrogen Bonding Using Inorganic Supramolecular Synthons: Lamellar, Stitched Stair‐Case, Linked‐Ladder, and Helical Structures

Balamurugan

Hundal

Mukherjee

2004

Chemistry A European J

135

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[1,4-Bis(pyridyl-2-ylmethyl)-1,4-diazacycloheptane]chlorocobalt(II) perchlorate

Abstract: Key indicatorsSingle-crystal X-ray study T = 293 K Mean '(C±C) = 0.009 A Ê R factor = 0.049 wR factor = 0.091 Data-to-parameter ratio = 14.1 For details of how these key indicators were automatically derived from the article, see

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First Systematic Investigation of CH⋅⋅⋅Cl Hydrogen Bonding Using Inorganic Supramolecular Synthons: Lamellar, Stitched Stair‐Case, Linked‐Ladder, and Helical Structures

First Systematic Investigation of CH⋅⋅⋅Cl Hydrogen Bonding Using Inorganic Supramolecular Synthons: Lamellar, Stitched Stair‐Case, Linked‐Ladder, and Helical Structures

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