Issue 17, 2009

Manipulating the crystal packing of pyDTDA radical ligand coordination complexes with Mn(ii) and Ni(ii)

Abstract

The synthesis of 4′-CN, 5′-CN and 5′-Br substituted pyDTDA neutral radical bidentate ligands is reported (pyDTDA = 4-(2′-pyridyl)-1,2,3,5-dithiadiazolyl). The Ni(hfac)2 and Mn(hfac)2 coordination complexes of both cyano substituted ligands, and the Mn(hfac)2 coordination complex of the bromo substituted ligand, have been prepared and the crystal packing of these is compared (hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato-). Unlike the previously reported Mn(hfac)2(pyDTDA), the Mn(hfac)2(4′-CN-pyDTDA) complex does not form dimers in the solid-state making it possible to measure the magnetic coupling between the unpaired electrons on the coordinated Mn(II) ion and the unpaired electron on the radical ligand by SQUID magnetometry; J/kB = −74(1) K, using H = −2J{SMn·SRad} and gav. = 2.01.

Graphical abstract: Manipulating the crystal packing of pyDTDA radical ligand coordination complexes with Mn(ii) and Ni(ii)

Supplementary files

Article information

Article type
Paper
Submitted
01 Oct 2008
Accepted
15 Jan 2009
First published
16 Mar 2009

Dalton Trans., 2009, 3193-3203

Manipulating the crystal packing of pyDTDA radical ligand coordination complexes with Mn(II) and Ni(II)

N. G. R. Hearns, R. Clérac, M. Jennings and K. E. Preuss, Dalton Trans., 2009, 3193 DOI: 10.1039/B817214E

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