1,721,066 research outputs found
Anion-anion dimerization in tetrabutylammonium hydrogensulfate
No full textThe hydrogensulfate ions of the title compound, C16H36N+. HSO4-, form hydrogen-bonded dimers
Isophthalamides and 2,6-dicarboxamidopyridines with pendant indole groups: a 'twisted' binding mode for selective fluoride recognition
No full textTwo cleft-like anion receptors have been synthesised that
contain indole hydrogen-bond donors and show fluoride
selectively in a DMSO–water solution with crystallographic
studies showing a ‘twisted’ binding mode for fluoride in the
solid state.
Twisted structures have long been of particular interest to the
supramolecular chemistry community. From early work on metal
templated helices1 through more recent work on foldamers2 and
organic helical structures,3 these species are not only elegantly
designed but can also play roles in molecular recognition and
sensing
Rapid structure determination of the hydrogen-containing compound Cs2C2O4 center dot H2O by joint single-crystal X-ray and powder neutron diffraction
No full textThe structure determination of caesium oxalate monohydrate using single-crystal X-ray diffraction, powder neutron diffraction data and a combination of both has been undertaken. Results show that even for hydrogen-containing materials data collected rapidly on a high-flux neutron diffractometer improve the refinement such that accurate positional and thermal displacement parameters can be extracted for all atom types. This contrasts with structural models extracted from either data set alone that demonstrate the inherent limitations of the individual diffraction methods. The rapidity with which useful neutron diffraction data has been collected from hydrogen-containing compounds, 10 min in this study, indicates that the technique should be widely applicable allowing the facile and accurate extraction of hydrogen positions for many compounds
A simple benzimidazole-based receptor for barbiturate and urea neutral guests that functions in polar solvent mixtures
No full textA 2,6-dicarboxamidopyridine cleft with appended benzimidazole groups functions as a receptor for neutral guests in solvent mixtures of DMSO-d6 and MeNO2-d3
Hypervalent intramolecular coordination in main group chemistry: a template synthesis and crystal structure of an ortho-oximinoarylphosphonium salt
No full textThe nickel(II)-catalysed reaction of triphenylphosphine with the oxime of ortho-bromoacetophenone gives an ortho-oximinoarylphosphonium salt, which shows a hypervalent intramolecular coordinative interaction between the oximino-nitrogen and the phosphonium centre
Bis(tetrabutylammonium) isophthalate 1-phenyl-3- [2,4,5-tris(3-phenylureido)phenyl] urea: a synchrotron study
No full textThe structure of 2C16H36N+·C8H4O42-·C34H30N8O4, comprises tapes of encapsulated hydrogen-bonded isophthalate anions which are arranged into parallel sheets interleaved with tetrabutylammonium layers; each of the two independent neutral molecules is disposed about a centre of inversion
Trans-dibromodioxodimethylformamide molybdenum(VI) MoO2Br2(OCHNMe2)(2)
No full textThe molecular structure of Trans-dibromodioxodimethylformamide molybdenum(VI), MoO2Br2(OCHNMe2)2 has been determined. Crystal data: Triclinic, P-1, a = 12.3005(2), b = 15.8763(4), c = 21.1653(6) Å, ? = 71.992(1)°, ? = 88.966(2)°, ? = 89.999(1)°, V = 3930.1(2) Å, Z = 12. Trans-dibromodioxodimethylformamide molybdenum(VI) was obtained by the reaction of sodium molybdate, HBr and dimethylformamide and was characterized by IR, and 1H NMR spectroscopy and elemental analysis
A mixed-halogen tricarbonyl manganese(I) complex: fac- MnBr0.3Cl0.7{Ph2P(CH2)(3)PPh2}(CO)(3)
No full textCrystals of the mixed halogen complex, fac-(bromo/chloro)tricarbonyl[ 1,3-bis(diphenylphosphino) propane] manganese( I), fac-[MnBr0.3Cl0.7(C30H26O3P2)(CO)(3)], were obtained from a prolonged recrystallization attempt of [MnBr{Ph2P(CH2)(3)PPh2}( CO)(3)] from CHCl3/hexane solution at 263 K. Common coordinates are found for all but the halogen atoms in the disordered structure, but the Mn-X vectors differ by 3.5 (5)degrees and the M - X bond lengths differ by 0.10 ( 1) Angstrom
Hypervalent tellurium compounds containing Te-N interactions. Mononuclear and polynuclear derivatives
No full textVarious organotellurium derivatives containing the pendant arm (2-Me2NCH2)C6H4 group have been prepared and characterized. The structure of a hydrolysis by-product, [(Ph2TeCl)(2)O](2), was also established
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