Articles

Ru(II) Complexes Incorporating Tetrathia-macrocycles: Synthesis And Conformational Analysis. Abstract The synthesis of a series of RuII complexes incorporating thiacrown ligands ([12]ane-S4, [14]ane-S4, [16]ane-S4), as well as 2,2′-bipyridine (bpy) or pyridine, is reported. Structural studies on these complexes have been carried out using a variety of techniques. Detailed 1H NMR spectroscopic studies on the previously reported…

C-H···O Hydrogen Bonds in Cyclohexenone Reveal the Spectroscopic Behaviour of C(sp3)-H and C(sp2)-H donors. Abstract C-H center dot center dot center dot O hydrogen bonds in liquid 2-cyclohenexen-1-one are studied to assess the vibrational spectroscopic behavior of the C-sp2-H and C-sp3-H donors. The presence of a pseudo-isosbestic point in the nu C&3bond; O region supports…

Synthesis and characterization of a manganese(II) acetonitrile complex supported on functionalized MCM-41. Abstract The acetonitrile complex [Mn(NCCH3)6] [B(C6F5)4]2 has been immobilized in the ordered mesoporous silica MCM-41 functionalized with a pyrazolylpyridine (PP) ligand. A metal loading of 0.72 wt.% (0.13 mmol g−1) was achieved. Powder X-ray diffraction and N2 adsorption–desorption analysis of the derivatized material…

Spectroscopic studies of europium(III) and gadolinium(III) tris-beta-diketonate complexes with diazabutadiene ligands. Abstract Adducts of the type Ln(NTA)(3)L-. [Ln = Eu, Gd; NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetonate; L = 1,4-diaza-1,3-butadiene RN=CHCH=NR (R = p-tolyl, o-tolyl)] were prepared by treatment of Ln(NTA)(3)(.)2H(2)O with one equivalent of the chelating N-N ligand. The mixed ligand complexes were characterised by elemental analysis,…

Towards the understanding of the spectroscopic behaviour of the C-H oscillator in C-H···O hydrogen bonds: the effect of solvent polarity Abstract The effect of solvent polarity versus specific C–H⋯O contacts on the vibrational νC–H mode is studied using CHCl3 as a model system. Ab initio SCI–PCM calculations show that the overall shift of the νC–H…