Comparative stereochemical populations and thermodynamics of structural interconversion of planar and tetrahedral cobalt(II) and nickel(II) complexes

Abstract

Reactions of Coordinated Ligands. XVIII. Metal Ion Control in the Synthesis of Octahedral Nickel(II) Complexes of

Influence of Ligand Substitution Pattern on Structure in Cobalt(II) Complexes of Bulky N,N′‐Diarylformamidinate N‐Oxides

“…The preference of 2a for the tetrahedral form is also supported by DFT calculations (vide infra). To eliminate the possibility of five‐ or six‐coordinate low‐spin species, and hence their influence on the observed magnetic moments, the adherence to the Beer–Lambert law was confirmed in the range of concentrations over which the magnetic and spectroscopic properties were measured (10 –5 –10 –3 M ) 6b. This would not be the case if dimerisation promoted octahedral coordination at higher concentrations.…”

Structure of a bis-bidentate metal complex, bis-(N-t-butylpyrrole-2-carbaldimino)nickel(II). Analysis of its configurational disorder in the crystalline state

“…It has been frequently reported (Braun & Lingafelter, 1966;Braun & Lingafelter, 1967;Sacconi, 1968;Everett & Holm, 1968) that for a given type of ligand in four-coordinate complexes, the nickel-donor atom bond distances increase as the structure goes from low-spin square-planar form to high-spin tetrahedral form, because of the decreased strength of the ~r bonds and possibly because of less favourable d,-p~ interaction in the latter form (Braun & Lingafelter, 1966;Braun & Lingafelter, 1967 The general validity of the model adopted here for the disorder has been established by the successful refinements of the structure. The rigid-group refinement, in which the t-butyl groups were allowed to 'float', with no constraints on their mode of attachment to N(1), resulted in reasonable geometry at these sites of attachment.…”

(β‐Oxoiminato)(phosphanyl)palladium Complexes as Highly Active Catalysts in Suzuki–Miyaura Coupling Reactions

“…β-Oxoimines have drawn much interest in coordination chemistry due to their resonance stability and unique structures. [8] Furthermore, the electronic and steric properties of β-oxoimine ligands can be partially controlled by changing the substituent on the N atom. [9] β-Oxoiminato complexes have been widely used as precursors in metalloorganic chemical vapor deposition.…”