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Issue 16, 2006
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Quasi-one-dimensional molecular magnets based on derivatives of (fluorobenzyl)pyridinium with the [M(mnt)2] monoanion (M = Ni, Pd or Pt; mnt2− = maleonitriledithiolate): Syntheses, crystal structures and magnetic properties

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Abstract

The syntheses, structural characterizations and magnetic behaviors of three new complexes, 1-(3′,4′,5′-trifluorobenzyl)pyridinium [M(mnt)2] [M = Ni (1), Pd (2) or Pt (3)], are reported. These complexes are isomorphous and their prominent structural character is that the [M(mnt)2] anions form columnar stacks, in which the dimerization was observed. Complexes 2 and 3 are diamagnetic, while 1 possesses an energy gap of 2474 K. For crystal 4, 1-(4′-fluorobenzyl)pyridinium [Ni(mnt)2] (its structure and magnetic susceptibility were briefly reported earlier), the magnetic behavior can be divided into two regimes, namely, weakly ferromagnetic coupling above 93 K and strongly antiferromagnetic coupling below 93 K. A transition occurs at 93 K which switches the magnetic exchange nature from ferromagnetic to antiferromagnetic. A sharp thermal abnormality with λ-shape, associated with the transition, appears from its heat capacity measurement to indicate that the transition is first order. The temperature dependences of the superlattice diffractions revealed the existence of the pretransitional phenomena up to at least 140 K. The unusual magnetic behavior of 4, such as the origin of the ferromagnetic interaction in the high temperature phase and what causes the spin transition, are discussed further.

Graphical abstract: Quasi-one-dimensional molecular magnets based on derivatives of (fluorobenzyl)pyridinium with the [M(mnt)2] monoanion (M = Ni, Pd or Pt; mnt2− = maleonitriledithiolate): Syntheses, crystal structures and magnetic properties

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Publication details

The article was received on 07 Oct 2005, accepted on 05 Jan 2006 and first published on 23 Jan 2006


Article type: Paper
DOI: 10.1039/B514278D
Citation: Dalton Trans., 2006,0, 1988-1994
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    Quasi-one-dimensional molecular magnets based on derivatives of (fluorobenzyl)pyridinium with the [M(mnt)2] monoanion (M = Ni, Pd or Pt; mnt2− = maleonitriledithiolate): Syntheses, crystal structures and magnetic properties

    X. M. Ren, S. Nishihara, T. Akutagawa, S. Noro, T. Nakamura, W. Fujita, K. Awaga, Z. P. Ni, J. L. Xie, Q. J. Meng and R. K. Kremer, Dalton Trans., 2006, 0, 1988
    DOI: 10.1039/B514278D

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