9 research outputs found
Bis(1,3-dibenzylimidazolium) μ-oxido-bis[trichloridoferrate(III)]
In the title compound (C17H17N2)2[Fe2Cl6O], obtained from the solid-state reaction of FeCl2 and N,N′-dibenzylimidazolium chloride, the complex anion has approximate D
3d symmetry with crystallographically imposed inversion symmetry coincident with the bridging μ-O atom. The stereochemistry about each FeCl3O centre is distorted tetrahedral [Fe—Cl = 2.2176 (5)–2.2427 (5) Å and Fe—O = 1.7545 (2) Å]. The Cl atoms are involved in weak anion–cation C—H⋯Cl interactions, giving a network structure
Two-step solid-state synthesis of PEPPSI-type compounds
peer-reviewedThe two-step mechanochemical preparation of carbene–pyridine complexes of palladium and platinum is reported. The organometallic products, which represent a class of commercially available catalysts, are rapidly formed in excellent yield proving solvent-free synthesis to be a viable synthetic alternative even in the case of NHC-containing compounds
Two-Step Mechanochemical Synthesis of Carbene Complexes of Palladium(II) and Platinum(II)
A mechanochemical
strategy for the synthesis of <i>N</i>-heterocyclic carbene
complexes is described, in which 1,3-dibenzylimidazole
complexes of palladium and platinum are produced in a two-step process
by grinding together the reactants with a mortar and pestle. Crystallographic
characterization reveals that unlike the solution syntheses, which
produce a mixture of products, the solid-state reactions occur under
topochemical conditions affording isomerically and polymorphically
pure products
Mechanism of Nonlinear Optical Enhancement and Supramolecular Isomerism in 1D Polymeric Zn(II) and Cd(II) Sulfates with Pyridine-4-aldoxime Ligands
Interaction of zinc(II) and cadmium(II) sulfates with pyridine-4-aldoxime (4-pyao) and pyridine-4-amidoxime (4-pyamo) ligands resulted in four 1D metal-organic materials (MOMs) with identical composition, [M(SO 4)A2(H2O)2]n, where M = Zn(II), A = 4-pyao for 1, M = Cd(II), A = 4-pyao for 2, M = Zn(II), A = 4-pyamo for 3, M = Cd(II), A = 4-pyamo for 4, and mononuclear [Zn(SO4)(4- pyamo)2(H2O)3] 5. New coordination polymers represent the mixed-ligand supramolecular isomers different by the twisting of two pyridine-4-oxime ligands in the metal coordination environments, and crystallizing in the different space groups. Conformational preferences and nonlinear optical properties of the 4-pyao and 4-pyamo complexes were investigated using density functional theory. Spectral properties of 1-3 have been also evaluated. The solid-state emission of 1D polymers 1-3 appears to be ligand-based, as the positions of the emission maxima remain practically unchanged from free ligand to complexes. The enhancement of luminescence and two-photon absorption in polymers in comparison with the pure ligands is attributed to the chelation of the ligand to the metal center. The detailed mechanism of this enhancement upon complex formation is analyzed and can be used in future design of metal-organic nonlinear optical materials. © 2014 American Chemical Society