| Abstrakt: |
The heterotrimetallic species [Ni(acacen)KLa(pta)4] [H2acacen and Hpta being N,N′‐ethylenebis(acetylacetonimine) and 1,1,1‐trifluoro‐5,5‐dimethyl‐2,4‐hexanedione, respectively] was obtained by interaction of Ni(acacen) with KLa(pta)4in chloroform. From the X‐ray, single crystal structure determination, the potassium cation acts as a bridge between the complex anion [La(pta)4]−and the neutral complex Ni(acacen). Sublimation, thermal behaviour, pressure, and composition of the vapour phase have been investigated for both [Ni(acacen)KLa(pta)4] and the parent complexes Ni(acacen) and KLa(pta)4, by means of thermal analysis and mass spectrometry using a Knudsen cell. The heterotrimetallic molecule was not found in the saturated vapour. Two processes take place upon heating: [Ni(acacen)KLa(pta)4](s)→ [KLa(pta)4](s)+ Ni(acacen)(g)and [KLa(pta)4](s)→ [KLa(pta)4](g). The standard free energy of formation for [Ni(acacen)KLa(pta)4] have been estimated (ΔGf0380K= −6.1±2 kJ/mol). [Ni(acacen)KLa(pta)4] can be sublimed completely at low pressure because both parent complexes KLa(pta)4and Ni(acacen) are volatile. |
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