187 research outputs found
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Cytenamide-1,4-dioxane (2/1)
No full textIn the crystal structure of the title compound [systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide-1,4dioxane(2/1)], 2C(16)H(13)NO center dot C4H8O2, the cytenamide molecules form a hydrogen-bonded R-2(2)(8) dimer. The solvent molecule is located between two adjacent cytenamide dimers and forms N-H center dot center dot center dot O hydrogen bonds with one cytenamide molecule from each dimer
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Cytenamide trifluoroacetic acid solvate
No full textCytenamide forms a 1:1 solvate with trifluoroacetic acid (systematic name: 5H-dibenzo[a, d] cycloheptatriene-5-carboxamide trifluoroacetic acid solvate), C16H13NO center dot C2HF3O2. The compound crystallizes with one molecule of cytenamide and one of trifluoroacetic acid in the asymmetric unit; these are linked by O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds to form an R-2(2)(8) motif. The trifluoromethyl group of the solvent molecule displays rotational disorder over two sites, with site-occupancy factors of 0.964 (4) and 0.036 (4)
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Cytenamide-butyric acid (1/1)
No full textCytenamide forms a 1:1 solvate with butyric acid [systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide-butanoic acid (1/1)], C16H13NO center dot C4H8O2. The title compound crystallizes with one molecule of cytenamide and one of butyric acid in the asymmetric unit; these molecules are linked by N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds to form an R-2(2)(8) heterodimer motif. Pairs of adjacent motifs are further connected via N-H center dot center dot center dot O interactions to form a discrete centrosymmetric assembly
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Phosphorescence quantum yield enhanced by intermolecular hydrogen bonds in Cu4I4 clusters in the solid state
No full textOrgano-copper(I) halide complexes with a Cu4I4 cubane core and cyclic amines as ligands have been synthesized and their crystal structures have been defined. Their solid state photophysical properties have been measured and correlated with the crystal structure and packing. A unique and remarkably high luminescence quantum yield (76%) has been measured for one of the complexes having the cubane clusters arranged in a columnar structure and held together by N–HI hydrogen bonds. This high luminescence quantum yield is correlated with a slow radiationless deactivation rate of the excited state and suggests a rather strong enhancement of the cubane core rigidity bestowed by the hydrogen bond pattern. Some preliminary thin film deposition experiments show that these compounds could be considered to be good candidates for applications in electroluminescent devices because of their bright luminescence, low cost and relatively easy synthesis processe
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Cytenamide acetic acid solvate
No full textIn the crystal structure of the title compound (systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide ethanoic acid solvate), C16H13NO center dot C2H4O2, the cytenamide and solvent molecules form a hydrogen-bonded R-2(2)(8) dimer motif, which is further connected to form a centrosymmetric double ring motif arrangement. The cycloheptene ring adopts a boat conformation and the dihedral angle between the least-squares planes through the two aromatic rings is 54.7 (2)degrees
Formalising Graphical Behaviour Descriptions
No full textCRESS (Chisel Representation Employing Systematic Specification) is used for graphical behaviour description, underpinned by formal and implementation languages. Plug-in frameworks adapt it for particular application domains such as Intelligent Networks, Internet Telephony and Interactive Voice Response. The CRESS notation and its syntax are explained. The semantics of CRESS is discussed with reference to its interpretation in LOTOS
An Overview of Powder X-ray Diffraction and Its Relevance to Pharmaceutical Crystal Structures
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