Browsing by Autor "Joazaizulfazli Jamalis"

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Síntesis y caracterización estructural de un nuevo derivado pirazolínico
(Universidad de Los Andes, 2019) Yemilet López; Lusbely M. Belandria; Suk-Ming Liew; Joazaizulfazli Jamalis; Gerzón E. Delgado
En este trabajo se presenta la síntesis y caracterización estructural de un derivado pirazolínico: 1-(3-(4-iodofenil)-5-(3-metiltiofen-2-il)-4,5-dihidro-1H-pirazol-1-yl)etano-1-ona. Este compuesto se sintetizó a partir de una chalcona heterocíclica y se caracterizó mediante técnicas de FT-IR, 1H-RMN, 13C-RMN y DRX. El estudio por difracción de rayos-X indica que este material cristaliza en una celda monoclínica con grupo espacial I2/a y parámetros de celda a = 25,4315(13) Å, b =5,1216(3) Å, c = 26,2639(14) Å,β= 105,767(5)°. El empaquetamiento cristalino se rige por interacciones intermoleculares débiles del tipo C--H··π que producen una eficiencia de empaquetamiento del 65,5%
Síntesis y caracterización estructural de una nueva chalcona conteniendo dos anillos tiofénicos
(Universidad de Los Andes, 2019) Ruby Zerpa; Lusbely M. Belandria; Helmi Mohammed Al‐Maqtari; Hasnah Mohd Sirat; Joazaizulfazli Jamalis; Gerzón E. Delgado
En este trabajo se presenta la síntesis y caracterización estructural de la chalcona (E)-3-(5-bromotiofeno-2-il)-1- (2,5-diclorotiofeno-3-il)-2-propen-1-ona. Este compuesto se sintetizó utilizando el método de condensación de Claisen-Schmidt y se caracterizó mediante técnicas de FT-IR, 1H-RMN, 13C-RMN y DRX. El estudio por difracción de rayos-X indica que esta nueva chalcona cristaliza en una celda monoclínica con grupo espacial P21/n. El empaquetamiento cristalino se rige por interacciones intermoleculares débiles del tipo C--H···O formando cadenas a lo largo de la dirección b descritas por el grafo C(8), con una eficiencia de empaquetamiento de 71,4%.
X-RAY POWDER DIFFRACTION DATA FOR A NEW PIRAZOLINE COMPOUND
(2019) Gerzón E. Delgado; Pilar Delgado–Niño; Robert Lobatón; S-M LIEW; Joazaizulfazli Jamalis
Pyrazolines are important agents in medicinal chemistry as a promising scaffold for structural modification and drug development studies due to their wide range of biological activities such as anticancer, antifungal, antibacterial, antidepressant, anticonvulsant, antitubercular, antioxidant, antileishmanial and antiinflammatory activity. These heterocyclic compounds can be prepared by refluxing chalcone with hydrazine hydrate and anhydrous sodium acetate in the presence of glacial acetic acid. The structural characterization, molecular and crystalline structure, of these organic compounds, allows studying their biological properties to know their potential applications. Hence the use of XRPD is very important because it allows obtaining a record to be used as a method of identification. The aim of this investigation was to obtain and reported good quality Xray powder diffraction data the pyrazoline compound 1-(3-(4-iodophenyl)-5-(3-methyl thiophen-2-yl)-4,5-dihydro-1H-pyrazol-1-yl)ethan-1-one, which could be used as potential anti-microbial and anti-cancer agent. The powder pattern was indexed in the monoclinic space group I2/a with unit cell parameters a = 25.440(5) Å, b = 5.124(2) Å, c = 26.261(6) Å, b = 105.75(2)° and figures of merit M20= 38.2 and F20= 66.6 (0.00573, 53). All measured lines were indexed and are consistent with the monoclinic space group. The powder pattern will be included in the Powder Diffraction File database to be used as a reference.
X-RAY POWDER DIFFRACTION DATA FOR A NEW THIOPHENE CHALCONE OBTAINED BY A CLAISEN-SCHMIDT REACTION
(2019) Gerzón E. Delgado; Pilar Delgado–Niño; Joazaizulfazli Jamalis
Chalcones and their heterocyclic derivatives have gained considerable importance in recent years due to their wide range of pharmacological properties including anti-AIDS agents, anti-bacterial, anti-malarial, antiinflammatory, anti-leishmanial, anti-oxidant, anti-cancer, anti-tuberculosis anti-microbial activity. These important compounds are conventionally synthesized by Claisen-Schmidt condensation reaction in which aldehyde reacted with acetophenone in the presence of aqueous alkaline bases. Hence the importance of characterizing new derivatives using different techniques both spectroscopic and diffractometric to know their molecular and crystalline structure, but also techniques that allow to study their biological properties to know their possible applications. X-ray powder diffraction is the technique most widely used for the identification of crystalline materials and hence the importance of reporting powder patterns in the Powder Diffraction File database. Therefore, the objective of this investigation is to obtain and reported good quality X-ray powder diffraction data (d-spacing and relative intensity of observed hkl reflections) of the new hetererocyclic chalcone derivative; (E)-3-(5-bromo thiophen-2-yl)-1-(2,5-dichlorothiophen-3-yl)-2-propen-1-one. This new compound was synthesized by Claisen-Schmidt condensation method among a series of thiophene derivative chalcones as potential anti-cancer and anti-microbial agents. The powder pattern was indexed in the monoclinic space group P21/n with unit cell parameters a= 4.0323(7) Å, b= 13.551(3) Å, c= 23.511(5) Å, β= 94.27(1), Z = 4, V= 1281.1(3) Å3, and figures of merit M20= 18.2 and F30= 47.6 (0.0143, 44). All measured lines were indexed and are consistent with the monoclinic space group.