http://rdu.iquimica.unam.mx/handle/20.500.12214/102 Fri, 13 Mar 2026 01:17:34 GMT 2026-03-13T01:17:34Z http://rdu.iquimica.unam.mx/handle/20.500.12214/1319 Title: Electrochemically relevant physical–chemical properties of tetraalkylammonium salts solutions in the renewable solvent dihydrolevoglucosenone (Cyrene®); electrochemical behaviour of some representative organic molecules Author: Ramos Villaseñor, José Manuel Abstract: Currently, organic electrosynthesis (OES) represents an environmentally friendly methodology that avoids the use of toxic reagents and the generation of chemical waste during the synthesis of a wide variety of organic compounds. However, the continued use of harmful or toxic organic solvents remains a significant environmental concern. Therefore, to achieve the ecological goal of reducing the amount of organic solvents or replacing them, it is essential to investigate the electrochemistry of more environmentally friendly solvents derived from renewable sources. Dihydrolevoglucosenone (DLG or Cyrene™) is a biodegradable, bio-renewable solvent produced from cellulose mass. Its dielectric constant is comparable to that of DMF, NMP, and DMAc, which makes it a suitable candidate for applications in organic electrochemistry. Consequently, this work investigates the conductivity, viscosity behaviour, and IR spectroscopy of tetraalkylammonium salt solutions in DLG, which are commonly used as supporting electrolytes in OES. Additionally, the study of the electrochemical behaviour of representative molecules (ferrocene, phenol, EDOT, indole, morpholine, phthalimide, and nitro derivatives) demonstrates the feasibility of utilising this renewable solvent. Wed, 01 Jan 2025 00:00:00 GMT http://rdu.iquimica.unam.mx/handle/20.500.12214/1319 2025-01-01T00:00:00Z http://rdu.iquimica.unam.mx/handle/20.500.12214/1318 Title: Ring-Opening Polymerization of Fused Salt-Templated non-Eutectic and Eutectic Mixtures for Biodegradable Macroporous Scaffolds Author: Quiñonez Angulo, Maria Priscila Contributor: Barrera-Rivera, Karla A. Abstract: The low-temperature and organocatalyzed ring-opening polymerization (ROP) of eutectic and non-eutectic mixtures of L-lactide (LLA) and ε-caprolactone (CL) was conducted under solventless conditions using lactates as sustainable initiators. This approach successfully yielded biodegradable three-dimensional (3D) macroporous scaffolds via a fused salt-templated process. To gain insight into the eutectic formation in LLA-CL mixtures, density functional theory (DFT) modeling was performed. Additionally, structural characterization through NMR, X-ray diffraction, and DSC confirmed the successful ROP, and formation of semicrystalline scaffolds via a fused-salt templating process. Mechanical testing revealed that scaffold strength and elasticity could be tuned by adjusting molecular weight and crystallinity of the polyesters. Hydrolytic degradation studies showed gradual weight loss, consistent with scaffold composition. Furthermore, cytotoxicity evaluations demonstrated that the scaffolds exhibit suitable biocompatibility, making them promising candidates for tissue engineering purposes. Wed, 01 Jan 2025 00:00:00 GMT http://rdu.iquimica.unam.mx/handle/20.500.12214/1318 2025-01-01T00:00:00Z http://rdu.iquimica.unam.mx/handle/20.500.12214/110 Title: DNA-UBP-dynamics Author: Joaquín Barroso_Flores Sat, 01 Oct 2016 00:00:00 GMT http://rdu.iquimica.unam.mx/handle/20.500.12214/110 2016-10-01T00:00:00Z