Exchange Effects in Polynuclear Chromium (III) Complexes View Full Text


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Chapter Info

DATE

1987

AUTHORS

Hans U. Güdel

ABSTRACT

Coordination compounds containing dinuclear and tetranuclear complexes of Cr3+ have been studied by modern spectroscopic techniques. Energy splittings resulting from exchange interactions in the ground and first excited state of [(NH3)5CrOHCr(NH3)5]Cl5•H2O were determined by absorption and luminescence spectroscopy as well as inelastic neutron scattering (INS). The strength of the exchange coupling increases by 5–10% between 300K and 10K. Time-resolved optical spectroscopy was used to study the kinetics and mechanism of excitation energy transfer. A phonon assisted electric dipole-dipole process is the relevant mechanism for interdimer transfer. The complicated exchange splitting pattern in the tetranuclear complex [Cr4(OH)6(NH3)12]Cl6•H2O was unravelled by INS. Next-nearest-neighbour exchange as well as biquadratic and possibly three-center exchange terms contribute significantly to the splitting. In the series of compounds Cs3C2X9 (X = Cl, Br, I) the interplay of a relatively strong intradimer and weak interdimer interactions lead to very interesting low-temperature properties. INS proved to be the most powerful technique for studying and understanding their behaviour. More... »

PAGES

69-83

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-009-3781-9_4

DOI

http://dx.doi.org/10.1007/978-94-009-3781-9_4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034269314


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