Heterometallic coordination compounds based on copper(II) and palladium(II) β-diketonates \(\text{ }\!\![\!\!\text{ Cu}{{\text{L}}_{\text{2}}}\cdot \,\text{Pd}{{\text{L}}_{\text{2}}}]\) (L = 2-methoxy-2,6,6-trimethylheptane-3,5-dionato) and \(\text{ }\!\![\!\!\text{ Cu}{{(\text{hfa})}_{\text{2}}}\,\cdot \text{Pd}{{\text{L'}}_{\text{2}}}]\) (hfa = hexafluoroacetylacetonate, L′ = 1,1,1-trifluoro-5-methoxy-5-methylhexane-2,4-dionato) with a polymeric chain-like crystal structure can be used to prepare Cu–Pd films by MOCVD. It was previously suggested that the Pd:Cu ratio in the films is related to the stability of binuclear complexes \(\text{Cu}{{\text{L}}_{\text{2}}}\cdot \,\text{Pd}{{\text{L}}_{\text{2}}}\)and \(\text{Cu}{{(\text{hfa})}_{\text{2}}}\,\cdot \,\text{Pd}{{\text{L'}}_{\text{2}}}\) (the forms these compound adopt in the gas phase). In the present work, the most probable structure of such binuclear complexes at 0 K is determined, their stability is studied, and interatomic interactions are analyzed by density functional theory calculations. The monometallic fragments of the complexes are connected by a network of weak non-covalent interactions, the Cu⋯O contact being the strongest one. When modeling such systems, empirical corrections are shown to be essential for the account of dispersion interactions.

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Mirzaeva, I.V., Kozlova, S.G. & Krisyuk, V.V. QUANTUM CHEMICAL STUDY OF THE STABILITY OF COPPER-PALLADIUM COMPLEXES IN THE GAS PHASE. J Struct Chem 62, 9–18 (2021). https://doi.org/10.1134/S0022476621010029

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  • transition metal β-diketonates
  • density functional theory
  • non-covalent interactions
  • AIM theory
  • NBO.