Browsing by Author "Gauthier, Carmen Valdez"
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Item Metadata only Copper(II) Complexes with Tridentate Bis(pyrazolylmethyl)pyridine Ligands: Synthesis, X-ray Crystal Structures and ϵ-Caprolactone Polymerization(Wiley-Blackwell, 2017-10) Rueda‐Espinosa, Juan; Torres, Juan F.; Gauthier, Carmen Valdez; Wojtas, Lukasz; Verma, Gaurav; Macías, Mario A.; Hurtado, JohnAbstract: Reactions of Cu(ClO4)2⋅6H2O with 2,6‐bis(3,5‐dimethylpirazol‐1‐ylmethyl)pyridine (dmpz‐py) (1), 2,6‐bis(4‐iodo‐3,5‐dimethylpirazol‐1‐ylmethyl)pyridine (I‐dmpz‐py) (2) and 2,6‐bis(4‐nitro‐3,5‐dimethylpirazol‐1‐ylmethyl)pyridine (NO2‐dmpz‐py) (3) yield the corresponding metal complexes: [Cu(dmpz‐py)(H2O)(ClO4)]ClO4 (4), [Cu(I‐dmpz‐py)(H2O)](ClO4)2 (5) and [Cu(NO2‐dmpz‐py)(H2O)(ClO4)2] (6). The complexes were isolated in high yields as stable solids at room temperature and characterized by melting point, electrical conductivity, and infrared and ultraviolet/visible spectroscopy. In addition, the crystal structures of the new complexes were determined by single‐crystal X‐ray diffraction and showed square‐base pyramidal (4), distorted square‐planar (5) and octahedral (6) geometries. All three complexes were active in the ring opening polymerization of ϵ‐caprolactone under solvent‐free conditions, producing polycaprolactones of narrow polydispersity and high crystallinity. The results obtained show an important increase in polymerization speed compared with analogous azole‐derived copper (II) complexes. [ABSTRACT FROM AUTHOR]Item Metadata only Division of Chemical Education Programfor the Fall 2010 ACS National Meeting in Boston.(American Chemical Society, 2010-08) Smith, Julie; Snyder, Nicole L.; Gauthier, Carmen ValdezThe Division of Chemical Education Program for the Fall 2010 ACS National Meeting in Boston on August 22–26, 2010, is presented. The Division of Chemical Education technical sessions will be held in the Seaport Hotel, 200 Seaport Boulevard. The Undergraduate Research Poster and Sci-Mix will be held in the Boston Convention and Exhibition Center. The program schedule is provided.Item Metadata only Poly(methyl methacrylate) composites of copper-4,4′-trimethylenedipyridine(Royal Society of Chemistry, 2012) Liu, Shisi; Ananthoji, Ramakanth; Han, Sungyub; Knudsen, Bernard; Li, Xiao; Wojtas, Lukasz; Massing, Justin; Gauthier, Carmen Valdez; Harmon, Julie P.We prepared a series of poly(methyl methacrylate) (PMMA) composites with a novel one dimensional coordination polymer copper-4,4′-trimethylenedipyridine (CU-TMDP). The CU-TMDP was sonicated in a methyl methacrylate monomer and polymerized in situ. Thermal, mechanical and optical properties of CU-TMDP–PMMA composites were probed via optical microscopy, Raman spectroscopy, differential scanning calorimetry (DSC), microhardness, and dynamic mechanical analysis (DMA). The CU-TMDP was characterized by X-ray crystallography. The functionality of the CU-TMDP interacted with the polymer matrix such that mechanical properties are tuned by varying CU-TMDP loadings. The data point to the fact that interactions are primarily due to London dispersion forces or dipole–dipole interactions. This initial study forms the basis for future applications requiring tailored mechanical properties.Item Metadata only Poly(methyl methacrylate) composites of copper-4,4′-trimethylenedipyridine(New Journal of Chemistry, 2012-07) Liu, Shisi; Ananthoji, Ramakanth; Han, Sungyub; Knudsen, Bernard; Li, Xiao; Wojtas, Lukasz; Massing, Justin; Gauthier, Carmen Valdez; Harmon, Julie P.A series of poly(methyl methacrylate) (PMMA) composites were prepared with a novel one dimensional coordination polymer copper-4,4′-trimethylenedipyridine (CU-TMDP). The CU-TMDP was sonicated in a methyl methacrylate monomer and polymerized in situ. Thermal, mechanical and optical properties of CU-TMDP–PMMA composites were probed via optical microscopy, Raman spectroscopy, differential scanning calorimetry (DSC), microhardness, and dynamic mechanical analysis (DMA). The CU-TMDP was characterized by X-ray crystallography. The functionality of the CU-TMDP interacted with the polymer matrix such that mechanical properties are tuned by varying CU-TMDP loadings. The data point to the fact that interactions are primarily due to London dispersion forces or dipole–dipole interactions. This initial study forms the basis for future applications requiring tailored mechanical properties.Item Metadata only Spattering and crackle of hot cooking oil with water: A classroom demonstration and discussion(American Chemical Society Division of Chemical Education, 2009) Pinto, Gabriel; Gauthier, Carmen ValdezThe well-known effect where hot vegetable oil will pop and spatter when it comes in contact with water is used in an activity to teach chemistry concepts that include boiling point, miscibility, and density of liquids. The importance of heat points for oils and the intermolecular interactions of vegetable oils are also taught.