Synthesis and crystal structure of a disubstituted nickel(II) bis-[(di-methyl-amino-phenyl-imino)-eth-yl]pyridine chloride complex.

The solvated title compound, bis-[2,6-bis-(1-{[4-(di-methyl-amino)-phen-yl]imino-κ}eth-yl)pyridine-κ]nickel(II) dichloride-di-chloro-methane-water (1/2/2), [Ni(CHN)]Cl·2CHCl·2HO, represents a nickel(II) bis-(pyridine di-imine) complex with electron-donating di-methyl-amino-phenyl substituents. The complex crystallizes as a water/di-chloro-methane solvate with ' = 2, thus the asymmetric unit consists of two Ni complex cations, four chloride anions, four adventitious water and four di-chloro-methane solvent mol-ecules. Around each octa-hedrally coordinated Ni cation, one pendant phenyl group on each of the two ligands has an intra-molecular π-π inter-action with the pyridine ring of the other chelating ligand.

Crystal structure of (1,1')-1,1'-(pyridine-2,6-di-yl)bis-[-(2,3,4,5,6-penta-fluoro-phen-yl)ethan-1-imine].

The title compound, CHFN, represents a potential redox non-innocent pyridine di-imine ligand system. It consists of a central pyridine ring with two penta-fluoro-phenyl substituted imine groups in positions 2 and 6. The whole mol-ecule is generated by mirror symmetry, the mirror bis-ecting the N and -C atom of the pyridine ring.

C-H activation of ethers by pyridine tethered PCsp3P-type iridium complexes.

Iridium PCsp3P complexes featuring a novel bis(2-diphenylphosphinophenyl)-2-pyridylmethane ligand (PC(Py)HP) are reported. C-H activation reactions between the dihydride complex [(PC(Py)P)Ir(H)2] and tetrahydrofuran or methyl tert-butyl ether in the presence of a hydrogen acceptor, norbornene (NBE), at ambient temperature led exclusively to the hydrido oxyalkyl complexes, [(PC(Py)P)IrH(C4H7O)] and [(PC(Py)P)IrH(CH2O(t)Bu)], respectively. The internal pyridine donor is important and stabilizes these species by coordination to the iridium center.

Effect of pnictogen ligand substitution on a tripalladium ditropylium core.

A combination of multinuclei NMR, UV-vis spectroscopy, and single crystal X-ray diffraction was used to characterize a new series of tripalladium ditropylium sandwich complexes [Pd(3)Tr(2)(E)(3)][BF(4)](2) (E = PPh(3), AsPh(3), and SbPh(3) and PEt(3)). Ligand substitution leads to a systematic shift of the (1)H and (13)C NMR tropylium resonances and is correlated with the electron donating properties of the substituent group. Replacement of the ligand increases the palladium-pnictogen bond length in the order P < As < Sb; however, this only slightly alters the internal Pd-Pd bond lengths, supporting the hypothesis that there are only weak Pd-Pd bonding interactions.

Monomers and polymers of tripalladium(0) ditropylium halides.

The synthesis and characterization of a series of polymeric complexes based upon a central tripalladium ditropylium (Tr) unit [Pd(3)Tr(2)] and containing different halide ligands are reported. The complexes were synthesized in good yield and characterized by multinuclei NMR spectroscopy, mass spectrometry, microanalysis, and X-ray crystallography. An unexpected product was an inorganic polymer consisting of linked individual tripalladium ditropylium units [Pd(3)Tr(2)X(2)](infinity) (X = Cl, Br, and I); this is the first reported, crystallographically characterized example of polymeric tripalladium complexes with halide ligands.