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In the title mol-ecule, C(19)H(17)N(3)O(6), the indole ring system is essentially planar (r.m.s. deviation = 0.009 Å) and forms a dihedral angle of 31.96 (9)° with the nitro-substituted benzene ring. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers which are connected by further N-H⋯O hydrogen bonds into a two-dimensional network parallel to (102).
The whole mol-ecule of the title compound, C20H14O6, is generated by mirror symmetry, the mirror bis-ecting the central benzene ring. The carbonate groups adopt an s-cis-s-cis conformation, with torsion angles of 58.7 (2) and 116.32 (15)°. The crystal structure of 1,3-phenyl-ene bis-(phenyl carbonate) contains no strong hydrogen bonds, though weak C-H⋯O and offset π-π inter-actions are observed...
Selective Formation of Trimethylene Carbonate (TMC): Atmospheric Pressure Carbon Dioxide Utilization
Carbon dioxide utilisation (CDU) is currently gaining increased interest due to the abundance of CO2 and its possible application as a C1 building block. We herein report the first example of atmospheric pressure carbon dioxide incorporation into oxetane to selectively form trimethylene carbonate (TMC), which is a significant challenge as TMC is thermodynamically less favoured than its correspo...
Water diffusion through a TiO₂/poly (carbonate urethane) nanocomposite designed for the eco-sustainable protection of outdoor cultural heritage stonework was investigated. Water is recognized as a threat to heritage, hence the aim was to gather information on the amount of water uptake, as well as of species of water molecules absorbed within the polymer matrix. Gravimetric and vibrational spec...
The oxidation of [Co(edta)](2-) by [IrCl(6)](2-) proceeds by both inner-sphere and outer-sphere electron-transfer pathways. In the presence of added [Co(en)(3)](3+), the outer-sphere pathway is enhanced. When optically active [Co(en)(3)](3+) is used, the [Co(edta)](-) formed is optically active, reflecting a 1.5% DeltaLambda selectivity. It is proposed that the selectivity arises from preferent...
Different methods for the functionalization of carbonate hydroxyapatite granules with free amine groups by reaction with (3-aminopropyl)triethoxysilane (APTES) have been compared in order to improve the potential for tethering of bioactive molecules to bioceramics. The combined use of tetraethoxyorthosilicate and APTES with acid catalysis resulted in an evident increase in amine surface grafting.
The asymmetric unit of the title compound, C(12)H(11)NO(5), contains two independent mol-ecules with similar geometric parameters but different orientations of the phenyl rings. The mol-ecular packing is stabilized by weak nonclassical C-H⋯O hydrogen-bonding inter-actions.
Jean Pierre Schatzmann Peron, Auriléia Aparecida de Brito, Mayra Pelatti, Wesley Nogueira Brandão, Luana Beatriz Vitoretti, Flávia Regina Greiffo, Elaine Cristina da Silveira, Manuel Carneiro Oliveira-Junior, Mariangela Maluf, Lucila Evangelista, Silvio Halpern, Marcelo Gil Nisenbaum, Paulo Perin, Carlos Eduardo Czeresnia, Niels Olsen Saraiva Câmara, Flávio Aimbire, Rodolfo de Paula Vieira, May...
We demonstrate a novel approach for synthesizing porosity-controlled calcium carbonate by one-step thermal decomposition of various calcium carboxylate derivatives as well as their mixtures with different molar ratios. By varying the volume content of calcium in the calcium compounds or mixtures, the resulting porous calcium carbonate exhibits distinct porosity and structures that are very prom...
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