Abstract
Binuclear copper(I) hexafluoroacetylacetonate (hfac) complexes with non-cyclic divinyl ligands of [Cu I(hfac)] 2L composition ( 1) L=1,5-hexadiene (HD), ( 2) L=allyl ether, ( 3) L=diallyldimethylsilane, ( 4) L=1,3-divinyltetramethyldisiloxane were prepared. Sublimation tests showed that the complexes 1 and 4 are most thermally stable and can be sublimated at 50–70 °C in a vacuum (5 × 10 −4 Torr) with good yield (>80%). The new yellow crystalline complex 4 is air stable at room temperature and 1 is stable under an inert atmosphere. These complexes were characterized by NMR spectroscopy, TG-DSC analysis and single crystal X-ray diffraction. The [Cu(hfac)] 2L composition for both complexes is realized by copper atom coordination to one vinyl and one hexafluoroacetylacetonate group. The main reason of volatility and thermal stability of compounds 1 and 4 is high symmetry and hence low polarity of their molecules resulting in a relatively low energy of the lattice. Higher thermal stability of 4 in comparison with 1 is due to the stronger metal–ligand bonding due to the presence of dimethylsilyl groups.
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