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Interpretive Summary: Hybrid materials, bring together two materials typically a substrate and a platform to enhance the function of substrate. This work presents a new class of stimuli responsive multi-functional materials based on platinum(II) terpyridyl @ silica composites. Presented here is the impact of pore size on the spectroscopy of Pt(II) complex. Silica materials with varying pore sizes (2-50 nm,
Interpretive Summary: Mechanochromic materials respond to mechanical stimulus by changing color under mechanical stress such as grinding and touching. There is interest in such materials as stress sensors and in security applications. Stacking platinum (Pt) complexes have shown promise as mechanochromic materials. Changes in the environment that these complexes are exposed to, such as a mechanical change, can cause changes in the Platinum complex causing a colorimetric change in the material that can be visually observed. The change in color can also be measured via UV-visible and emission spectroscopy. However, the mechanism of this rearrangement and structural changes are not well understood. Here we report the crystal structures of the Pt stacking material before and after the mechanochromic event. Red crystals of [Pt(tpy)Cl]NO3.HNO3 were grown from nitric acid and acetone were shown to respond to touch by turning yellow. The structure of both crystals (the red and yellow) were determined using X-ray crystallography. Single crystal information was obtained through emission spectroscopy as well. We mapped out the structural rearrangement that would have to occur that would result in a shift from the red structure to the yellow structure using structural mapping. This research is significant because there is a serious gap in structural information in a mecahnochromic system. The structural information attained here can help us gain insight into the mechanochromic mechanism and aid in designing mechanochromic materials with specific properties.
Although many photographers experiment with the platinum process, few have explored the medium as extensively as Lois Conner, Scott Davis, Kenro Izu and Andrea Modica. Each of these four photographers have produced extensive bodies of work in platinum, exploiting the particular characteristics of the materials to produce innovative and compelling prints.
The Place Where Clouds Are Formed is an interdisciplinary arts collective that examines the intersection of spirituality, migration, and current and historical policies that have impacted the borderlands of the Sonoran Desert.
Louis Carlos Bernal: Retrospectiva presents some 125 photographs by the pioneering Chicanx photographer active in the 1970s and 1980s, focusing on his moving portrayals of Mexican American people living in the barrios of Tucson and throughout the Southwest.
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