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Burdinski D, Bill E, Birkelbach F, et al. Long-range exchange interactions and integer-spin S(t) = 2 EPR spectra of a Cr(III)Zn(II)Cr(III) species with multiplet mixing. Inorg Chem. 2001;40(6):1160-6doi: 10.1021/ic000870h.
Burdinski, D., Bill, E., Birkelbach, F., Wieghardt, K., & Chaudhuri, P. (2001). Long-range exchange interactions and integer-spin S(t) = 2 EPR spectra of a Cr(III)Zn(II)Cr(III) species with multiplet mixing. Inorganic chemistry, 40(6), 1160-6. https://doi.org/10.1021/ic000870h
Burdinski, D, et al. "Long-range exchange interactions and integer-spin S(t) = 2 EPR spectra of a Cr(III)Zn(II)Cr(III) species with multiplet mixing." Inorganic chemistry vol. 40,6 (2001): 1160-6. doi: https://doi.org/10.1021/ic000870h
Burdinski D, Bill E, Birkelbach F, Wieghardt K, Chaudhuri P. Long-range exchange interactions and integer-spin S(t) = 2 EPR spectra of a Cr(III)Zn(II)Cr(III) species with multiplet mixing. Inorg Chem. 2001 Mar 12;40(6):1160-6. doi: 10.1021/ic000870h. PMID: 11300812.
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Inorg Chem. 2001 Mar 12;40(6):1160-6. doi: 10.1021/ic000870h.

Long-range exchange interactions and integer-spin S(t) = 2 EPR spectra of a Cr(III)Zn(II)Cr(III) species with multiplet mixing.

Inorganic chemistry

D Burdinski, E Bill, F Birkelbach, K Wieghardt, P Chaudhuri

Affiliations

  1. Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany.

PMID: 11300812 DOI: 10.1021/ic000870h

Abstract

Synthesis, structural, and spectroscopic characterization of the linear cationic complex [LCr(III)(mu-[dmg)(3)Zn(II))Cr(III)L](2+) (1) in which L = 1,4,7-trimethyl-1,4,7-triazacyclononane and dmg is the dimethylglyoximato anion are reported. The Cr...Cr distance of 1 is 7 A. SQUID magnetic susceptibility measurements reveal the presence of long-range exchange interaction of the Cr(III) terminal ions, mediated by the diamagnetic Zn(II)(dmg)(3) "bridging ligand" (J(0) = -4.4 cm(-1), H(ex) = -2J(0)S(1)S(2), S(i) = 3/2). Multifrequency EPR measurements (S-, X-, Q-band) on frozen solutions were used to establish the intramolecular nature of the exchange coupling and to determine the zero-field splitting (ZFS) parameters and the anisotropic contributions of spin coupling. An effective spin Hamiltonian description was applied for interpretation of the spectra originating from the S(t) = 2 total spin manifold which included up to fourth-order terms for the ZFS. By the help of alternative simulations with the full coupling matrix for two spins S(i) = 3/2 (16 x 16) it could be shown that the higher-order terms in the effective description owe their origin to multiplet mixing due to competing single-ion ZFS (the absolute value of D(i) = 0.2 cm(-1)) and isotropic exchange interaction. The magnetic anisotropy related to dimer properties could be readily explained by dipolar coupling (j(z) = -0.012 cm(-1)). Implications for the interpretation of other integer-spin EPR spectra are discussed.

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