structure of (E)-1-(4-Methoxyphenyl)-2-Nitropropene

An important feature of the molecule is its non-planarity, the nitropropane' ando me.thoxyphenyl groups exhibiting a dihedral angle of 27.10 and torsion angles about the C(1)-C(7) bond of 26.6 and -155.80 •. The molecules pack to form chains with headto- tail short contacts between the methyl and nitro group~ of neighbouring molecules with O ..H distances of 2.528(4)A and O-H-C angles of 132. O(3) o. All intramolecular bonds and angles are within the expected range

Intercalation of polyethylene oxide PEO in layered MPS3 (M = Ni, Fe) materials

The intercalation compounds Li-0.96(H2O)(0.77)(PEO)(0.63)Ni0.48PS3 and Li-0.94(H2O)(0.92)(PEO)(0.94)Fe0.48PS3 obtained by the insertion of PEO in MPS3 form lithium-polyethylene oxide complexes containing Li+ exchangeable cation in the interlayer space. Polyethylene oxide (PEO) is able to associate interlayer cation increasing the ionic conductivity of NiPS3 and FePS3. These compounds constitute a new family of intercalates MPS3 (M = Ni, Fe) host-layer materials. The new materials were characterized by powder X-Ray diffraction (XRD), Fourier-transformed infrared (FT-IR), differential thermal and thermogravimetric analyses (DTA/TG), energy dispersive X-Ray (EDX), inductively coupled plasma (ICP) and electrochemical impedance measurements. The intercalation compound Li-0.96(H2O)(0.77)(PEO)(0.63)Ni0.48PS3 shows an ionic conductivity of 0.13 mu S/cm, and dc electronic conductivity of ca. 0.1 mu S/cm which is twice that of NiPS3

Crystal structure of potassium bismuth hexathiodiphosphate, KBiP2S6

BiKP2S6, monoclinic, P121 1 (No. 4), a = 6.6200(6) Å, b = 7.4058(7) Å. c = 9.9002(9) Å, β = 92.108(1)°, V = 485.0 Å3, Z = 2. Rgt(F) = 0.027,wRref(F2) = 0.060, T= 293 K. © 2014, Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 Münche

Structural characterization and dielectric properties of the solid solutions AgPb(Sb,Bi)S3

The new solid solutions AgPbSb1−xBixS3 were prepared by solid state reactions. The phases were characterized by powder X-ray diffractions (XRD), scanning electron microscopy, and thermal analysis. The XRD patterns of different members (x=0.5, 0.7, 0.8, and 1.0) are consistent with pure phases crystallizing in the cubic PbStype structure. The electrical characterization was carried out using ac impedance spectroscopy and dc methods. The temperature dependence of the dc conductivity shows typical semiconductor Arrhenius behavior. The impedance measurements were performed in the frequency range of 0.1 Hz to 10 MHz and at the temperature range of 15 °C to 350 °C. The ac conductivity conforms to Jonscher’s universal power law. The frequency dependence of the dielectric permittivity follows the normal dielectric material behavior, and the relaxation is thermally activated. The frequency and temperature dependences of the electrical data are found to follow Summerfield scaling formalism.Fondecyt No. 11090153 and grant “Proyecto de Iniciación VID 2008” no. I08/04-2

N-methyl-1H-indole-2-carboxamide from the marine fungus Cladosporium cladosporioides

The crystal structure of N-methyl-1H-indole-2-carboxamide C10H10N2O was determined by single crystal X-ray diffraction. The structure can be described as consisting of an indole group and as substituent, linked at C2, the N-methylcarboxamide group. The molecular structure is essentially planar. The crystal packing results in N-H-------O hydrogen bonds which join the molecules into centrosymmetric dimeric rings. The knowledge of the crystal structure allows a complete assignment of the 1H and 13C-NMR spectra. The N-methyl-1H-indole-2-carboxamide is the first indole derivative isolated from marine fungus

Crystal structure of 7-bromo-5,8-dihydroxy-4,4-dimethyl-4H-naphthalen-1-one

An X-ray diffraction study of the 7-bromo-5,8-dihydroxy-4,4-dimethyl-4H-naphthalen--1-one (1), obtained by bromination of 5,8-dihydroxy-4.4-dimethyl-4H-naphthalen-1-one with molecular bromine, gave unambiguous proof of its regiochemistry. Crystal is monoclinic, space group P2(1)/c, and the unit cell parameters are a = 8.300(1), b = 14.101(1), c = 19.239(2) Angstrom, beta = 93.91(1)degrees, Z = 8. The final R factor at room temperature was 0.036 for 1717 observed reflections. The molecular structure is essentially planar, with the exception of the geminal methyl groups, and no unusual bond lengths or angles were found

Efecto de la sustitución de cationes sobre las propiedades magnéticas en la serie de tioespinela Mn 1−x A' x Cr 2 S 4 (A' = Cd, Zn)

Los materiales de magnetorresistencia colosal (CMR) como las perovskitas REMnO 3 y las tioespinelas AB 2 S 4 han sido bien estudiados en el pasado. Los autores presentan compuestos de tioespinela con A = Mn, ya que pueden verse como un vínculo con las perovskitas REMnO 3 CMR. Se sabe que el MnCr 2 S 4 ferrimagnético presenta una T c de 65 K y una transición magnética hacia un estado Yafet-Kittel no colineal. La serie (Mn 1−x A' x )Cr 2 S 4 (A = Cd, Zn) se sintetizó a 850°C. Esta serie cristaliza en el grupo espacial Fd3m con cerca de 10 Å. Cuando A' = Cd (Tc que va desde 68 K, x = 0·2, hasta 79 K, x = 0·6), las características ferromagnéticas se mejoran, lo que indica que el antiferromagnetismo entre espines de Mn se pierde progresivamente. Para A' = Zn se producen dos transiciones magnéticas, una a 15 K que recuerda el estado antiferromagnético del ZnCr 2 S 4 y otra a T c = 115 K. Las impurezas que podrían ser responsables de estos dos estados magnéticos son excluido.Colossal magnetoresistance (CMR) materials such as REMnO3 perovskites and AB2S4 thiospinels have been well studied in the past. The authors present thiospinel compounds with A = Mn, since they may be viewed as a link to REMnO3 CMR perovskites. Ferrimagnetic MnCr2S4 is known to present a T c of 65 K and a magnetic transition towards a non-collinear Yafet-Kittel state. The (Mn1−xA’x)Cr2S4 series (A = Cd, Zn) was synthesised at 850°C. This series crystallises in the space group Fd3m with a close to 10 Å. When A’ = Cd (T c ranging from 68 K, x = 0·2, to 79 K, x = 0·6), the ferromagnetic features are enhanced, indicating that antiferromagnetism between Mn spins is progressively lost. For A’ = Zn, two magnetic transitions take place, one at 15 K, which is reminiscent of the antiferromagnetic state of ZnCr2S4 and another one at T c = 115 K. Impurities which could be responsible of these two magnetic states are excluded

Tonal vivienda solar

En 2007, el Departamento de Energía de Estados Unidos lanzó la convocatoria del Solar Decathlon, que busca dar respuesta a las problemáticas ambientales y sociales como el cambio climático, crisis económica y mala calidad de vivienda en zonas urbanas crecientes. A lo largo del periodo de primavera 2017, se trabajó en la continuación del proceso de creación de una propuesta de vivienda sustentable óptima para la participación del ITESO en la segunda edición del Solar Decathlon Latinoamérica, que se llevará a cabo en junio de 2018 en Cali, Colombia. La metodología de trabajo consistió en ocho equipos que estuvieron a cargo de distintas partes del proyecto. Como resultado, se tiene un prototipo de vivienda social adaptada a la colonia de San Pascual, ubicada en el centro de Cali; en esta propuesta se engloban aspectos de sustentabilidad y bioclimatismo.ITESO, A.C.Bloquera Carrill