Unexpected linkage isomerism in chiral tetranuclear bis-tridentate (1,2,3-triazol-4-yl)-picolinamide (tzpa) grids

Hegarty, Isabel N.; Dalton, Hannah L.; Henwood, Adam F.; Hawes, Chris S.; Gunnlaugsson, Thorfinnur

Abstract

The synthesis of a chiral bis-tridentate (1,2,3-triazol-4-yl)-picolinamide (tzpa) ligand is described and its coordination chemistry with Cu(NO3)2 and [Cu(MeCN)4]PF6 is explored in the crystalline phase as well as in solution. Chiral [2 × 2] tetranuclear square grid complexes [Cu4(H21)4](NO3)8 and [Cu4(H1)4](PF6)4 were observed, and crystallographically analysed, these being linkage isomers with N4O2 and N5O coordination spheres, respectively. These come about by an unusual in situ amide deprotonation and coordination, which accompanies a CuI ? CuII oxidation process.

• Acceptance Date: Jul 15, 2019
• Publication Date: Aug 18, 2019
• Journal: Chemical Communications
• Print ISSN: 1359-7345
• Publisher: Royal Society of Chemistry
• Pages: 9523-9526
• DOI: https://doi.org/10.1039/c9cc03316e
• Publisher URL: http://doi.org/10.1039/c9cc03316e