A heteroleptic diradical Cr(<scp>iii</scp>) complex with extended spin delocalization and large intramolecular magnetic exchange
作者:Xiaozhou Ma、Elizaveta A. Suturina、Mathieu Rouzières、Fabrice Wilhelm、Andrei Rogalev、Rodolphe Clérac、Pierre Dechambenoit
DOI:10.1039/d0cc00548g
日期:——
Successive chemical reductions of the heteroleptic complex [(tpy)CrIII(tphz)]3+ (tpy = terpyridine; tphz = tetrapyridophenazine) give rise to the mono- and di-radical redox isomers, [(tpy)CrIII(tphz˙-)]2+ and [(tpy˙-)CrIII(tphz˙-)]+, respectively. As designed, the optimized overlap of the involved magnetic orbitals leads to extremely strong magnetic interactions between the S = 3/2 metal ion and S =
Using Redox-Active π Bridging Ligand as a Control Switch of Intramolecular Magnetic Interactions
作者:Xiaozhou Ma、Elizaveta A. Suturina、Mathieu Rouzières、Mikhail Platunov、Fabrice Wilhelm、Andrei Rogalev、Rodolphe Clérac、Pierre Dechambenoit
DOI:10.1021/jacs.9b03044
日期:2019.5.15
terpyridine; tphz, tetrapyridophenazine) were tailored by changing the oxidation state of the pyrazine-based bridging ligand. While its neutral form mediates a weak antiferromagnetic (AF) coupling between the two S = 1 Ni(II), its reduced form, tphz•-, promotes a remarkably large ferromagnetic exchange of +214(5) K with Ni(II) spins. Reducing twice the bridging ligand affords weak Ni-Ni interactions, in marked
A Redox-Active Bridging Ligand to Promote Spin Delocalization, High-Spin Complexes, and Magnetic Multi-Switchability
作者:Xiaozhou Ma、Elizaveta A. Suturina、Siddhartha De、Philippe Négrier、Mathieu Rouzières、Rodolphe Clérac、Pierre Dechambenoit
DOI:10.1002/anie.201803842
日期:2018.6.25
A dinuclear CoII complex, [Co2(tphz)(tpy)2]n+ (n=4, 3 or 2; tphz: tetrapyridophenazine; tpy: terpyridine), has been assembled using the redox‐active and strongly complexing tphz bridgingligand. The magneticproperties of this complex can be tuned from spin‐crossover with T1/2≈470 K for the pristine compound (n=4) to single‐molecule magnet with an ST=5/2 spin ground state when once reduced (n=3) to
One-Step Syntheses of Tetrapyrido[2,3-a:3',2'-c:2'',3''-h:3'', 2'' '-j] Phenazine and Dibenzo[a:c](Dipyrido[2,3-h:2',3'-j]) Phenazine
作者:Gourdon, Andre
DOI:10.1080/00397919708004166
日期:1997.8
The one-step syntheses of two fully aromatic planar bis-terdentate bridging ligands are described.
Efficient Synthesis of 1,4,5,12-Tetraazatriphenylene and Derivatives
作者:Chandima Abeywickrama、Arthur David Baker
DOI:10.1021/jo0495283
日期:2004.10.1
Condensation of 5,6-diamino-4,7-phenanthroline with glyoxal provides 1,4,5,12-tetraazatriphenylene in quantitative yield. This procedure avoids the 50% loss of product inherent in previous methods. Derivatives were also prepared by using alpha-dicarbonyl compounds other than glyoxal. Additional derivatives were prepared from 1,4,5,12-tetraazatriphenylene-2,3-dicarbonitrile, produced by condensation of diaminomaleonitrile with 4,7-phenanthroline-5,6-dione.