649 research outputs found
Glyoxal 4-nitrophenylhydrazone : triple helices linked into a three-dimensional channel structure
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Four related benzazepine derivatives in a reaction pathway leading to a benzazepine carboxylic acid : hydrogen-bonded assembly in zero, one, two and three dimensions
The authors thank âCentro de Instrumentacion Cientıfico-Tecnica of Universidad de Jaenâ and the staff for data collection. AP, SAG and CMS thank Colciencias for financial support (grant No. 1102â521â28229). JC thanks the Consejerıa de Innovacion, Ciencia y Empresa (Junta de Andalucıa, Spain) and the Universidad de Jaen for financial support.(2R*,4S*)-Methyl 2,3,4,5-tetraÂhydro-1,4-epÂoxy-1H-benz[b]azepine-2-carboxylÂate, C12H13NO3, (I), and its reduction product (2R*,4S*)-methyl 4-hyÂdroxy-2,3,4,5-tetraÂhydro-1H-benz[b]azepine-2-carboxylÂate, C12H15NO3, (II), both crystallize as single enantiÂomers in the space group P212121, while the hydrolysis product (2RS,4SR)-4-hyÂdroxy-2,3,4,5-tetraÂhydro-1H-benz[b]azepine-2-carbÂoxyÂlic acid, C11H13NO3, (III), and the lactone (2RS,5SR)-8-(trifluoromethoxy)-5,6-dihydro-1H-2,5-methanobenz[e][1,4]oxazocin-3(2H)-one, C12H10F3NO3, (IV), both crystallize as racemic mixtures in the space group P21/c. The molÂecules of compound (IV) are linked into centrosymmetric R22(10) dimers by N-HO hydrogen bonds, and those of compound (I) are linked into chains by C-H(arene) hydrogen bonds. A combination of O-HO and O-HN hydrogen bonds links the molÂecules of comÂpound (III) into sheets containing equal numbers of R44(14) and R44(26) rings, and a combination of C-H(arene) hydrogen bonds and three-centre O-H(N,O) hydrogen bonds links the molÂecules of compound (II) into a three-dimensional frameÂwork structure. Comparisons are made with some related compounds.Publisher PDFPeer reviewe
Hydrogen bonding in C-methylated nitroanilines : the three-dimensional framework structure of 2-methyl-4-nitroaniline
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A triclinic polymorph of benzanilide : disordered molecules form hydrogen-bonded chains
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2,6-Diiodo-4-nitrophenol, 2,6-diiodo-4-nitrophenyl acetate and 2,6-diiodo-4-nitroanisole: interplay of hydrogen bonds, iodo-nitro interactions and aromatic [pi]-[pi]-stacking interactions to give supramolecular structures in one, two and three dimensions
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Hydrogen bonding in substituted nitroanilines : isolated nets in 1,3-diamino-4-nitrobenzene and continuously interwoven nets in 3,5-dinitroaniline
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How do hospitals respond to feedback about blood transfusion practice? A multiple case study investigation
National clinical audits play key roles in improving care and driving system-wide change. However, effects of audit and feedback depend upon both reach (e.g. relevant staff receiving the feedback) and response (e.g. staff regulating their behaviour accordingly). This study aimed to investigate which hospital staff initially receive feedback and formulate a response, how feedback is disseminated within hospitals, and how responses are enacted (including barriers and enablers to enactment). Using a multiple case study approach, we purposively sampled four UK hospitals for variation in infrastructure and resources. We conducted semi-structured interviews with staff from transfusion-related roles and observed Hospital Transfusion Committee meetings. Interviews and analysis were based on the Theoretical Domains Framework of behaviour change. We coded interview transcripts into theoretical domains, then inductively identified themes within each domain to identify barriers and enablers. We also analysed data to identify which staff currently receive feedback and how dissemination is managed within the hospital. Members of the hospitalâs transfusion team initially received feedback in all cases, and were primarily responsible for disseminating and responding, facilitated through the Hospital Transfusion Committee. At each hospital, key individuals involved in prescribing transfusions reported never having received feedback from a national audit. Whether audits were discussed and actions explicitly agreed in Committee meetings varied between hospitals. Key enablers of action across all cases included clear lines of responsibility and strategies to remind staff about recommendations. Barriers included difficulties disseminating to relevant staff and needing to amend feedback to make it appropriate for local use. Appropriate responses by hospital staff to feedback about blood transfusion practice depend upon supportive infrastructures and role clarity. Hospitals could benefit from support to disseminate feedback systematically, particularly to frontline staff involved in the behaviours being audited, and practical tools to support strategic decision-making (e.g. action-planning around local response to feedback)
Azide, water and adipate as bridging ligands for Cu(II) : synthesis, structure and magnetism of (ÎŒ4-adipato-Îș-O)(ÎŒ-aqua)(ÎŒ-azido-ÎșN1,N1)copper(II) monohydrate
The Distinguished Scientist Fellowship Program (DSFP) at King Saud University is gratefully acknowledged. The authors are grateful to the Algerian MESRS (MinistĂšre de lâEnseignement SupĂ©rieur et de la Recherche Scientifique), the UniversitĂ© Ferhat Abbas SĂ©tif 1, the KSU DSFP program and the Spanish MINECO (CTQ2014-52758-P and MAT2014-56143-R) and the Generalitat Valenciana (PrometeoII/2014/076) for financial support.The synthesis, characterization, single crystal structure and magnetic properties of the compound [(CuN3(OH2))2(adp)]n (1) are presented, in which adp stands for the adipate(2-) anion. This compound consists of layers containing chains of six-coordinated Cu(II) ions; the chains are connected by ÎŒ4adipate anions. The magnetically interesting part of the compound is the Cu(II) chain, built from 3 bridging ligands, i.e. a water ligand, an azide anionic ligand bridging by using a terminal N atom to connect 2 Cu(II) ions, and one symmetrically bridging carboxylato group of adipate; the other end of the tetradentate adipate anions symmetrically connect the chains, forming the layers. From the magnetic point of view the compound is considered as a Cu(II) chain with a quite unusual, symmetrical water bridge, the ÎŒ-syn-syn carboxylate and the ÎŒ-N3 bridge. The bridging water also hydrogen bonds to a terminal N of a nearby azido ligand. Magnetic susceptibility measurements show that 1 presents moderate ferromagnetic intrachain interactions (Jchain = +38.4 cm-1) with a metamagnetic behaviour for the inter-chain interaction with a critical field of 0.7 T.PostprintPeer reviewe
Between the point of view and the point of being: the space of the stereoscopic tours
One of the most interesting features of the travel stereoview
series is not their three-dimensional effect
but rather the intertwined outcome of realism and
âbeing-therenessâ in the experience of early twentieth
century armchair travellers. On the set of Italy through
the Stereoscope, the viewerâs âpath of the gazeâ was a
novelty compared to two dimensional photographs
and stereoviews. The Underwood & Underwood publishing
company created a stereoscopic multimodal
tour to improve the impression of realism with a proprioceptive
perception of the scene. The procedure of
textual débrayage, the description of the experience as
it is happening here and now, the direction of the viewerâs
gaze with a narrative itinerary, the changing of the
visual convergence with the variation in the points of
attention: all of these elements fostered a synaesthesia
for the spectator. The result was immersion in an explorable
space between the âpoint of viewâ (2D images)
and the âpoint of beingâ (virtual reality)
Poly[[chlorido-(1,10-phenanthroline-Îș2N,NâČ)copper(II)]-ÎŒ3-1,1,3,3-tetra-cyano-2-eth-oxy-propenido- Îș3N:NâČ:NâČâČ] : coordination polymer sheets linked into bilayers by hydrogen bonds
The authors acknowledge the Algerian DGâRSDT (Direction Generale de la Recherche Scientifique et du Developpement Technologique) and the Algerian ATRST (Agence Thematique de Recherche en Sciences et Technologie; PNR project) for financial support. ZS thanks Sandra Lebaroud for her help in preparing the manuscript and the Unit of Support for Technical and Scientific Research (UATRS, CNRST) for the X-ray measurements.In the title compound, [Cu(C9H5N4O)Cl(C12H8N2)] n or [Cu(tcnoet)Cl(phen)] n , where phen is 1,10-phenanthroline and tcnoet is 1,1,3,3-tetra-cyano-2-eth- oxy-propenide, the axially elongated (4 + 2) coordination polyhedron around the CuII centre contains N atoms from three different tcnoet ligands. The resulting coordination polymer takes the form of sheets which are linked in pairs by a single C - HâŻN hydrogen bond to form bilayers. The bond lengths provide evidence for significant bond fixation in the phen ligand and extensive electronic delocalization in the tcnoet ligand, where the two -C(CN)2 units are rotated, in conrotatory fashion, out of the plane of the central C3O fragment.Publisher PDFPeer reviewe
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