Synthesis, crystal structure, and magnetic properties of a dimeric quinoline adduct of copper(II) trifluoroacetate

Moreland, James A.; Doedens, Robert J.

doi:10.1021/ja00836a007

Cited by 49 publications

(24 citation statements)

References 2 publications

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“…1, with g = 2.26 and 2J = -217 cm-1 (50). This marked decrease of 1 2JI relative to the values generally observed for dimeric adducts of the unsubstituted alkanoates is in contrast to the 2J value of -310 cm-1 observed for [Cu(O2CCFs)2(quin)]2 (49). These results indicate that the variation of 2J with the properties of the bridging carboxylate group is not a simple function of the base strength of the bridging carboxylate group or of any other readily evident parameter.…”

Section: Molecular Sructure Of [Cu(o~ccf3)z(quin)]z One C R Group Hamentioning

confidence: 74%

Structure and Metal‐Metal Interactions in Copper(II) Carboxylate Complexes

Doedens

1976

Progress in Inorganic Chemistry

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193

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Section: Molecular Sructure Of [Cu(o~ccf3)z(quin)]z One C R Group Hamentioning

confidence: 74%

Structure and Metal‐Metal Interactions in Copper(II) Carboxylate Complexes

Doedens

1976

Progress in Inorganic Chemistry

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193

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“…The mean bond distances Cu-O and C-O, as well as the bond angle O-Cu-O, agree in the three analogous binuclear complexes Cuz(aC)g(C~-pic)z, Cu2(C1CHaCOO)4(c~-pic)2, and CUE (ac)4(py)2, within standard deviations However, the Cu-N bond lengths differ significantly. While the copper acetate pyridine complexes Barclay and Kennard, 1961) give a Cu-N separation of 2.13 ~ and the copper chloroacetate c~-picoline complex (Davey and Stephens, 1970) Bond angles (deg) Moreland and Doedens (1975).…”

Section: Structure Description and Discussionmentioning

confidence: 99%

Crystal and molecular structure of binuclear copper acetate mono-α-picoline

Pavelčík¹,

Hanic

1978

Journal of Crystal and Molecular Structure

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Green, needle-shaped crystals of copper acetate mono-e-picoline, Cu(ac)2-(e-pic), crystallize in space group P21/c with cell dimensions a=7.675(4), b =20.008(6), c= 8.207(4)~, and fl = 115.99(3) ~ The crystal structure has been solved by the heavy-atom method and refined with the three-dimensional x-ray photographic data to an R factor of 9.2%. The structure consists of binuclear units Cu2(act4(~-pic)2. The Cu-Cu distance is 2.671 ,~. The bond length Cu-N (2 24 A) is significantly longer than the corresponding distance in analogous complexes.

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“…This distance, and the arrangement of the chains of atoms, make a direct overlap seem unlikely. Furthermore, the quinoline adduct of copper(II) trifluoroacetate is binuclear with the molecular structure common to the copper acetate dimers [32]. The Cu-Cu distance is 0.2886 nm, a full 0.0272 nm longer than the corresponding distance in [Cu(OAch .…”

Section: +E(s;-s;)mentioning

confidence: 99%

Introduction to Magnetic Exchange: Dimers and Clusters

Carlin

1986

Magnetochemistry

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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

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Synthesis, crystal structure, and magnetic properties of a dimeric quinoline adduct of copper(II) trifluoroacetate

Cited by 49 publications

References 2 publications

Structure and Metal‐Metal Interactions in Copper(II) Carboxylate Complexes

Structure and Metal‐Metal Interactions in Copper(II) Carboxylate Complexes

Crystal and molecular structure of binuclear copper acetate mono-α-picoline

Introduction to Magnetic Exchange: Dimers and Clusters

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