1,10-Phenanthroline-5,6-dione (Phd) complexes of group 3 and lanthanide elements having formulae Ln(hfac)3 (Phd) (Ln = Y, Eu, Yb; hfac = hexafluoroacetylacetonate) were synthesised and characterised. Complexes of d-block elements of the type [MCl(Phd)(p-cymene)]+ (M = Ru, Os) were also prepared. In all these species, coordination of the polydentate ligand occurs by the N-donor moieties, as indicated by DFT calculations. The novel compounds were tested, together with fac-ReBr(Phd)(CO)3, as precursors for the preparation of heterobimetallic d/f derivatives. The reaction of the rhenium complex with yttrium or lanthanide anhydrous triflate salts led to the formation of the complexes ReBr(CO)3 (N,N′-Phd-O,O′)Ln(OTf)3(THF) (Ln = Y, Eu, Yb), where the trivalent ions interacted with the quinonoid moiety. The redox properties of the rhenium centre were strongly affected by the coordination of Ln(OTf)3, as observed by comparing the cyclic voltammetry measurements carried out on fac-ReBr(Phd)(CO)3 and on ReBr(CO)3 (N,N′-Phd-O,O′)Y(OTf)3.
‡Presented at the XXV. International Conference on Coordination and Bioinorganic Chemistry, Smolenice, Slovakia, 31 May–5 June 2015.
Acknowledgements.
The financial support received from Ca’ Foscari University of Venice is gratefully acknowledged (Progetti di Ateneo 2014).
Supplementary data
Supplementary data (the Cartesian coordinates of IIIY, IIIEu and IIIYb) associated with this article can be found in the online version of this paper (DOI: 10.1515/chempap-2015-0140).
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