934180-32-2Relevant academic research and scientific papers
Antiferromagnetic spin-coupling between MnII and amminium radical cation ligands: Models for coordination polymer magnets
Bushby, Richard J.,Kilner, Colin,Taylor, Norman,Williams, Rhidian A.
, p. 383 - 392 (2009/02/01)
One- and two-electron oxidation of the manganese(II) complex [L2Mn(hfac)2] (L = 4″,4?-di-tert-butyl-2′,2″,2?trimethoxy-{4-(4′-diphenylaminophenyl)pyridine}) were studied by ultra violet/visible/near infra red spectroscopy, cyclic voltammetry and magnetometry. A one-electron oxidation converts the triarylamine ligand to its radical cation and gives a complex in which the antiferromagnetic coupling between the spin on the ligand and that on the metal J/kb is -1.5 K. In a dilute frozen matrix and at low temperature this behaves as an S = 2 system. A two-electron oxidation gives [L2Mn(hfac)2]2{radical dot}+ which at low enough temperatures behaves as an S = 3/2 system but the spin-coupling between the metal and the ligand is weaker (J/kb = -0.3 K). The weakness of these spin-couplings mean that MnII/amminium radical cation complexes are not promising systems on which to base coordination polymer magnets. The equivalent copper(II) complex [L2Cu(hfac)2] was also investigated but this decomposes when an attempt is made to oxidise the ligand to its amminium radical cation.
Ferromagnetic spin-coupling 4,4″-through metaterphenyl: Models for high-spin polymers
Bushby, Richard J.,Taylor, Norman,Williams, Rhidian A.
, p. 955 - 964 (2008/02/01)
Model diradical dications have been synthesised which have the 4,4″-through metaterphenyl spin-coupling pathway found in arylamine high-spin polymers. In the model triplet diradical dication derived by a two-electron oxidation of N,N,N″,N″-tetrakis(4-tert
