Structural Variety in Transition Metal Complexes of Tripodal Ligands Containing Mixed Quinolyl and Pyridyl Donors.

The syntheses of the tripodal tetraamine ligands 2-(pyridin-2-yl)-N,N-bis(quinolin-2-ylmethyl)ethan-1-amine (DQPEA), N-(pyridin-2-ylmethyl)-2-(quinolin-2-yl)-N-(2-(quinolin-2-yl)ethyl)ethan-1-amine (DQEPMA), 2-(pyridin-2-yl)-N,N-bis(2-(quinolin-2-yl)ethyl)ethan-1-amine (DQEPEA), N,N-bis(pyridin-2-ylmethyl)-2-(quinolin-2-yl)ethan-1-amine (QEDPMA), and 2-(pyridin-2-yl)-N-(2-(pyridin-2-yl)ethyl)-N-(2-(quinolin-2-yl)ethyl)ethan-1-amine (QEDPEA) containing mixed quinolyl and pyridyl moieties are reported, with 2-vinylquinoline being used to attach quinolylethyl arms to the aliphatic N atom. X-ray crystal structures of [(Mn(DQPEA))O](ClO) ⋅ (CHCN), [Cu(DQPEA)NCCH](ClO), [Zn(DQPEA)NCCH](ClO), [Pd(DQEPEA)Cl]Cl ⋅ 11HO are detailed, with four, five, and six-coordination observed. In addition, the dimeric complex [(DPEA)Co(μ-OH)Co(DPEA)](ClO) ⋅ 0.

Co(III) complexes of the pentadentate NHC ligand PY4Im: carbene-induced influences and the non-disappearing C NMR peak.

Co(III) complexes of the N-heterocyclic carbene ligand PY4Im (PY4Im = (1,3-bis(bis(2-pyridyl)methyl)imidazol-2-ylidene)) having the general formula [(PY4Im)Co(X)](ClO) (X = NCMe; = 3: OH, N, NCS, ONO, F; = 2: OCO, = 1; (N), = 0) were prepared and structurally characterised. X-ray structural data are consistent with the presence of a influence due to the coordinated carbene carbon, and this is also supported by computational results. C NMR spectra of the complexes did not display peaks corresponding to the carbene carbon, except in the case of the [(PY4Im)Co(OCO)] cation, where a peak at = 170.