Nova et Vetera: Edición 6, febrero 24 - marzo 2 de 2014

INVERSIÓN EN BECAS DE EXCELENCIA ACADÉMICA – ARCHIVO REVISTA UNIVERSIDAD DEL ROSARIO – REGLAMENTACIÓN DE SEGUNDA Y TERCERA LENGUA – DANZA, CREATIVIDAD Y DISCAPACIDAD – HARVARD NATIONAL MODEL OF UNITED NATIONS – VICERRECTOR UNIVERSIDAD CATÓLICA BRASILIA – OBSERVATORIO DE VENEZUELA – CRISIS VENEZUELA – ESPECIALIZACIÓN EN GERENCIA DE NEGOCIOS INTERNACIONALES – CENTRO DE CONCILIACIÓN, CERTIFICADO ICONTEC – ALEXANDER TORRENEGRA, EL SOFÁ

Three substituted 4-pyrazolylbenzoates: hydrogen-bonded supramolecular structures in one, two and three dimensions

The molecules of ethyl 4-(5-amino-3-methyl-1H-pyrazol-1yl) benzoate, C13H15N3O2, are linked by two independent N-H center dot center dot center dot O hydrogen bonds into a chain of edge-fused and alternating R-4(2)(8) and R-2(2)(20) rings. A combination of N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds links the molecules of methyl 4-(5-amino-3-tert-butyl-1H-pyrazol-1-yl) benzoate, C15H19N3O2, into sheets of alternating R-2(2)(20) and R-6(6)(32) rings. In 4-(5-amino-3-methyl-1H-pyrazol-1-yl) benzoic acid monohydrate, C11H11N3O2 center dot H2O, the molecular components are linked into a three-dimensional framework structure by a combination of five independent hydrogen bonds, two of O-H center dot center dot center dot N type and one each of O-H center dot center dot center dot O, N-H center dot center dot center dot O and N-H center dot center dot center dot N types