Electronic influence of β-diketonato-type ligands on the coordination of 1,5-cyclooctadiene to palladium(II) as defined by `Venus fly trap' geometric parameters

A range of single-crystal structures of the type [Pd(cod)(LL′-Bid)]A, where LL′-Bid = acetylacetonato (acac), thenoyltrifluoroactetonato (thtfac) and hexafluoroacetylacetonato (hfacac), and A = tetrafluoroborate (BF4−) and hexafluoro­phosphate (PF6−), are reported. The complexes [Pd(cod)(acac)]PF6 (I), [Pd(cod)(thtfac)]PF6 (III), [Pd(cod)(thtfac)]BF4 (IV) and [Pd(cod)(hfacac)]PF6 (V) are isostructural in the monoclinic space group P21/c. The influence of the variation of the β-diketonato-type ligands on the coordination geometry of cis,cis-1,5-cycloocta-1,5-diene (cod) was investigated and found that no significant changes to the Pd—C and C=C bond distances were observed. The `Venus fly trap' parameters vary by 7.8° for the `jaw' angle (ψ), while the `bite' angle (χ) remains virtually constant.