Journal
JOURNAL OF LUMINESCENCE
Volume 101, Issue 4, Pages 307-315Publisher
ELSEVIER
DOI: 10.1016/S0022-2313(02)00573-2
Keywords
heterometallic complex; 4f-4f emission; 3d-3d emission; chromium(III); lanthanide(III)
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We report here the low temperature emission spectra in the heterometal dinuclear 3d-4f assembled molecular system [(acaC)(2)Cr-III(mu-ox)Ln(III)(HBpz(3))(2)] (Cr(ox)Ln:acac(-) = acetylacetonate, ox(2-) = oxalate, HBpz(3)(-) = hydrotris(pyrazol-1-yl)-borate; Ln = La, Nd, Ho, Er, Tm and Yb) in comparison with those of Na[Cr(acac)(2)(ox)] and [(HBpz(3))(2)Ln(mu-ox)Ln(HBpz(3))(2)](Ln = Nd and Er). From 10 to 150 K the Cr(ox)Ln complexes show a broad emission band around 800 nm from the E-2 state of Cr(III) moiety. At room temperature no E-2-(4)A(2) emission was observed in the Cr(ox)Ln except for the La and Lu complexes. On warming from 10 to 300 K rapid quenching of the E-2-(4)A(2) emission of Cr(III) is suggested to result from the energy transfer from Cr to Ln in the Cr(ox)Ln. The excitation spectra and the life-time were also measured with monitoring the 4f-4f emission peaks of the Cr(ox)Yb complex. (C) 2002 Elsevier Science B.V. All rights reserved.
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