Synthesis and structural and magnetic characterization of trans-aquatetraamminechromium(III)-.mu.-hydroxo-pentaamminechromium(III) chloride trihydrate [[(NH3)4(H2O)Cr(OH)Cr(NH3)5]Cl5.3H2O]

Cline, Susan J.; Glerup, Jørgen; Hodgson, Derek J.; Jensen, Gunnar S.; Pedersen, Erik

doi:10.1021/ic50221a058

Cited by 33 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed susceptibility data were fitted to the simple Van Vleck Hamiltonian = JSVS2 by using the fitting procedure described earlier. 5,12 The fit to this model, while generally good, is only approximate, the variance per degree of freedom being 4.07. Inclusion of a second-order term (biquadratic exchange) in the Hamiltonian10 = JS{-S2 ~j(SrS2)2 gave a markedly improved fit, the variance/degree of freedom falling to 1.12.…”

Section: Magnetic Propertiesmentioning

confidence: 90%

“…The magnetic susceptibility of a microcrystalline sample of the complex was measured by the Faraday method at a field strength of 12000 Oe in the temperature (2) 0.0981 (4) 0.4811 (2) 0.0062 (4) 0.6105 (2) 0.1155 (4) 0.3479 (2) 0.0202 (4) 0.4503 (2) 0.2295 (4) 0.5191 (4) 0.2053 (6) 0.4295 (5) 0.0794 (11) 0.5058 (4) 0.0007 (7) 0.5342 (4) 0.0406 (7) 0.6124 (4) 0.1114 (7) 0.6467 (4) 0.1484 (6) 0.7352 (4) 0.2249 (6) 0.7250 (5) 0.3134 (7) 0.8141 (4) 0.1393 (8) 0.7570 (5) 0.2990 (7) 0.5817 (5) 0.0025 (11) 0.1288 (6) 0.0344 (13) 0.1975 (4) 0.0070 (7) 0.2877 (4) 0.0723 (7) 0.2985 (4) 0.1939 (7) 0.3756 (4) 0.2685 (7) 0.3778 (4) 0.4034 (7) 0.2947 (5) 0.4441 (9) 0.4620 (6) 0.4306 (9) 0.3823 (7) 0.4780 (8) The refined atomic positional parameters, along with their estimated standard deviations, are collected in Table 11. The hydrogen atom coordinates, anisotropic librational parameters, and a listing of ohserved and calculated structure amplitudes, are available as supplementary material.…”

Section: Magnetic K P T I B F I T Y M~f S mentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of the alkoxo-bridged chromium(III) dimer bis(.mu.-methoxo)bis[bis(2,2,6,6-tetramethyl-3,5-heptanedionato)chromium(III)]

Fischer¹,

Hodgson²,

Pedersen³

1984

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

Section: Magnetic Propertiesmentioning

confidence: 90%

Section: Magnetic K P T I B F I T Y M~f S mentioning

confidence: 99%

Synthesis and characterization of the alkoxo-bridged chromium(III) dimer bis(.mu.-methoxo)bis[bis(2,2,6,6-tetramethyl-3,5-heptanedionato)chromium(III)]

Fischer¹,

Hodgson²,

Pedersen³

1984

Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

“…The magnitude of the exchange parameter depends upon the Cr-O-Cr bridging angle [68], the Cr-O bond length [69] and the dihedral angle between the bridge planes [70]. A number of data have been summarized [71,72] and applied to a model which has been constructed to include the different structural parameters.…”

Section: Some Other Dimersmentioning

confidence: 99%

Introduction to Magnetic Exchange: Dimers and Clusters

Carlin

1986

Magnetochemistry

View full text Add to dashboard Cite

Energy Levels and Specific Heats 71configurational mixing of states such as M+ F M2+. The electron on Fin (c) and (d) can now couple with the lone electron in a d z 2 orbital on an adjoining Ni2+ . The preferred coupling is to give a singlet state [(c), called antiferromagnetic] rather than a triplet, (d). This in turn stabilizes the singlet state (a) with respect to the triplet (b). The strength of the interaction will depend on the amount of overlap, and we present here only a model of 180° superexchange. Metal ion orbitals can also overlap with p" ligand orbitals at a 90° angle, and much recent research effort has gone into finding the factors which influence this superexchange interaction.This model, which has been applied to a variety of systems [1,2] is somewhat similar to that which is used for explaining spin-spin coupling in NMR spectroscopy [3]. The Hamiltonian in use for metal-metal exchange interaction in magnetic insulators is of the form (5.2) where the sum is taken over all pair-wise interactions of spins i and j in a lattice. For the moment, we shall restrict our attention to dimers, and thereby limit the summation to the two atoms 1 and 2 in the dimeric molecule, so thatThis is called an isotropic (note the dot product between the two spins, S) or Heisenberg Hamiltonian, and we adopt the convention that negative J refers to antiferromagnetic (spin-paired or singlet ground state in a dimer) interactions, and positive J refers to ferromagnetic (spin-triplet ground state) interactions. The exchange constant J is given in energy units (Kelvins) and measures the strength ofthe interaction. The reader must be careful in comparing different authors, for a variety of conventions (involving the negative sign and even the factor of 2) are in use. (The symbol J now takes a different meaning from its earlier use as the quantum operator for total angular momentum.) Energy Levels and Specific HeatsAn antiferromagnetic interaction ofthe type given in Eq. (5.3), when applied to two ions each of!/ = t gives a spin-singlet ground state and a spin-triplet 2J in energy above the singlet ( Fig. 5.2). Naturally, ifthe interaction were ferromagnetic, the diagram is simply inverted. For an external field applied along the z-axis of the pair, the complete Hamiltonian will be taken as

show abstract

“…The mixed complexes 12 and 18 were considered earlier. 5 In general the presence of mixed complex(es) is revealed by the appearance of new response(s) in addition to those of the parent species. In all cases (a-1) redistribution equilibrium was found to be readily achieved at room temperature.…”

mentioning

confidence: 99%

“…Cu(PhOMe)(PhNQ2) (4) -0.50 (-0.52) Fe(EtMe)(PhCl)2 (17) -0.52 (-0.50) Co(EtMe)2(EtN02) (5) -0.41 (-0.40)…”

mentioning

confidence: 99%

Ligand redistribution in triazene 1-oxide complexes: a voltammetric study

Mukherjee¹,

Chakravorty²

1984

Inorg. Chem.

View full text Add to dashboard Cite

Synthesis and structural and magnetic characterization of trans-aquatetraamminechromium(III)-.mu.-hydroxo-pentaamminechromium(III) chloride trihydrate [[(NH3)4(H2O)Cr(OH)Cr(NH3)5]Cl5.3H2O]

Cited by 33 publications

References 0 publications

Synthesis and characterization of the alkoxo-bridged chromium(III) dimer bis(.mu.-methoxo)bis[bis(2,2,6,6-tetramethyl-3,5-heptanedionato)chromium(III)]

Synthesis and characterization of the alkoxo-bridged chromium(III) dimer bis(.mu.-methoxo)bis[bis(2,2,6,6-tetramethyl-3,5-heptanedionato)chromium(III)]

Introduction to Magnetic Exchange: Dimers and Clusters

Ligand redistribution in triazene 1-oxide complexes: a voltammetric study

Contact Info

Product

Resources

About