Tetracyanoquinodimethane derivatives of fully condensed schiff base ligands derived from 2,6-diacetylpyridine: crystal structure of a nickel(ii) chloride complex with 2,6-diacetylpyridinebis(semicarbazone)

Abstract

The ligands 2,13-dimethyl-3,6,9,12,18-pentaaza-bicyclo[12.3.1]octadeca-1(17),2,12,14(18),15-pentaene (L₁) and 2,6-diacetylpyridinebis(semicarbazone) (L₂) give pentagonal bipyramidal complexes with some transition metal ions. The structure of [Ni-L₂(H₂O)₂]Cl₂·2H₂O has been determined by single-crystal X-ray methods. Further reaction of complexes of L₁ and L₂ with the lithium salt of 7,7′,8,8′,-tetracyanoquinodimethane (tcnq) gives the corresponding adducts.

Keywords:

• Schiff base
• Diacetylpyridine
• Semicarbazone
• Tetracyanoquinodimethane
• Pentagonal bipyramid
• X-ray structure

Acknowledgments

We acknowledge the helpful assistance of Mark Nieuwenhuyzen, Queen's University, Belfast, Northern Ireland for the crystallographic work and financial assistance from CSIR, New Delhi in the form of project No. 1(1731)/02/EMR-II to PK.

Supplementary Data

Full lists of crystallographic data are available from the authors upon request.