Showing papers by "George A. Koutsantonis published in 2012"
TL;DR: In this article, the authors used macrobicyclic hexamine ligands termed "sarcophagines" as templating agents in the synthesis of mesoporous silicas.
18 citations
TL;DR: In this article, the Hirshfeld surface approach and electrostatic potentials were used to analyze hexabromoethane and [CpRu(CO)2Br] co-crystals, showing that the most significant interactions within both crystal forms arise not from the closest van der Waals contacts but rather from more distant interactions between the unsymmetrical electron distributions about the bromine atoms in the solvate and substrate molecules.
Abstract: The interaction between hexabromoethane and [CpRu(CO)2Br] (Cp = (η-C5H5), results in the deposition of two different isostoichiometric co-crystals, 2[CpRu(CO)2Br]·C2Br6, one crystallising in space group P (Z = 1) and the other in P21/n (Z = 4). These were produced in the reaction of HCBr3 and [(CpRu(CO)2)2] under indoor illumination, following a slight modification of the literature procedure. The origin of the hexabromoethane is as yet unknown but it appears to have been formed in the reaction rather than being an impurity in the bromoform. We have analysed the structures using the Hirshfeld surface approach and electrostatic potentials, supported by DFT theoretical calculations to better define the nature of intermolecular interactions in the solid state. The results indicate that the most significant interactions within both crystal forms arise not from the closest van der Waals contacts but, rather, from more distant interactions between the unsymmetrical electron distributions about the bromine atoms in the solvate and substrate molecules.
17 citations
TL;DR: The chemistry and reactivity of ethyne-1,2-diyl compounds, LnM-CC-MLn, is reviewed in this article. But there appears to be no general route to the preparation of these complexes, except perhaps using acid/base methodology.
Abstract: The chemistry and reactivity of ethyne-1,2-diyl compounds, LnM–CC–MLn, is reviewed. These complexes are simple analogues of organic alkynes, or dimetalloalkynes, and there appears to be no general route to the preparation of these complexes, except perhaps using acid/base methodology. Reactivity patterns, in general, mimic those of simple organic alkynes but have the added dimension of reactive M–C(sp) bonds that sometimes participate in the formation of multimetallic compounds with metal electrophiles.
6 citations
TL;DR: In this article, single crystal X-ray studies are presented for the 'piano-stool' structures [CpRu,Os(CO)2Cl], [cp′Ru(CO 2X)2X] (X = Cl, Br, I (redetermination)), and [cpxRu(C5H4CH3), Cp*Ru (CO 2Cl)2CL] (two phases), enabling the assembly of comparative geometric data for these structures.
Abstract: Single crystal X-ray studies are presented for the ‘piano-stool’ structures [CpRu,Os(CO)2Cl], [Cp′Ru(CO)2X] (X = Cl, Br, I (redetermination)), [Cp*Ru(CO)2Cl] (two phases), enabling the assembly of comparative geometric data for the [CpM(CO)2Cl] (M = Fe, Ru, Os), [Cp,Cp′Ru(CO)2X] (X = Cl, Br, I) and [CpxRu(CO)2Cl] (Cpx = Cp (η–C5H5), Cp′ (η–C5H4CH3), Cp* (η–C5CH3)5,CpPh (η–C5(C6H5)5)). In the [Cp′Ru(CO)2X] arrays, the methyl groups are found to consistently lie ‘eclipsed’ vis-a-vis the halogen substituents, with a concomitant tilt of the Cp ring; the reasons for this are explored theoretically.
3 citations
1 citations