2014
DOI: 10.1039/c4cc06693f
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Abstract: Compound [Cr5(tpda)4Cl2] (H2tpda = N(2),N(6)-di(pyridin-2-yl)pyridine-2,6-diamine), an Extended Metal Atom Chain complex featuring two quadruply-bonded {Cr2} units, exhibits field-induced slow relaxation of its magnetization arising from the terminal chromium(II) ion and provides the first example of a chromium(II)-based Single-Molecule Magnet.

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Cited by 37 publications
(43 citation statements)
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“…Cornia et al studied the magnetic behavior of a Cr II complex [Cr 5 (tpda) 4 Cl 2 ] (67) that incorporated only one paramagnetic metal center in an almost ideal TP geometry (Fig. 23) [100]. The uni-axial magnetic anisotropy D = -1.53 cm -1 and the transverse anisotropy E of 0.01 cm -1 with g z = 1.975 and g x = g y = 1.99 were determined in magnetic studies and confirmed by HF-EPR.…”
Section: Edited June 25mentioning
confidence: 99%
“…Cornia et al studied the magnetic behavior of a Cr II complex [Cr 5 (tpda) 4 Cl 2 ] (67) that incorporated only one paramagnetic metal center in an almost ideal TP geometry (Fig. 23) [100]. The uni-axial magnetic anisotropy D = -1.53 cm -1 and the transverse anisotropy E of 0.01 cm -1 with g z = 1.975 and g x = g y = 1.99 were determined in magnetic studies and confirmed by HF-EPR.…”
Section: Edited June 25mentioning
confidence: 99%
“…Especially controversial is the interpretation of crystallographic data for tri-and pentachromium(II) derivatives [Cr 3 (dpa) 4 Cl 2 ] (1) and [Cr 5 (tpda) 4 Cl 2 ] (2) (see Scheme 1), which both behave as single molecule magnets at low temperature (Hdpa = N-( pyridin-2-yl)pyridin-2-amine, 13 H 2 tpda = N 2 ,N 6 -bis( pyridin-2-yl)pyridine-2,6-diamine, see Scheme 1). 14,15 The solid-state structures of these EMACs show metal atoms with abnormally elongated ( prolate) displacement ellipsoids along the chain axis, which can be interpreted as due to either large thermal vibrations or to positional disorder effects. The first model results in approximately equal metalmetal distances along the chain (Scheme 1a), which hint to electronic delocalization.…”
Section: Introductionmentioning
confidence: 99%
“…19,20 These complexes seemingly feature formally quadruply-bonded Cr 2 4+ units plus one terminal high-spin (S = 2) chromium(II) center, that in 2 exhibits a directionally-bistable magnetic moment and is at the origin of the observed SMM behaviour. 15 Structural information on chromium-based EMACs without the rigid constraints of a crystal lattice is comparatively scarce, 29,30 although such studies are of importance to the field of single-molecule electronics. Within the series [M n (L) 4 (SCN) 2 ] (M = Co, Ni for n = 3, 5; M = Cr for n = 3, 5, 7; L = oligo-α-pyridylamido ligand) the Cr derivatives are especially interesting in that they display the highest single-molecule conductance among strings of the same length.…”
Section: Introductionmentioning
confidence: 99%
“…[40,53,54,63,64] The equatorial and axial ligands have a significant influence of metal string complexes on the spin multiplicity and magnetism. [31,[65][66][67] Moreover, there are examples that the metalmetal bond order is associated with the axial ligand. Explicitly, the axial ligands of [Ru 3 (dpa) 4 (NCS) 2 ] and [Ru 3 (dpa) 4 (CN) 2 ] (dpa − : dipyridylamido anion) lead to the respective bond orders of 1.5 and 0.75, attributed to a stronger ligand-field effect of ─CN, which stabilizes π* as a result of π-back-donating interactions.…”
mentioning
confidence: 99%