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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3

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Now showing 1 - 10 of 23
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    The first alkaline-earth azidoaurate(III), Ba[Au(N-3)(4)](2) center dot 4 H2O
    (Wiley, 2023) Prots, Yurii; Jach, Franziska; Afyon, Semih; Höhn, Peter; Department of Chemistry; Department of Chemistry; Department of Chemistry; Subaşı, Yaprak; Tekin, Elif Sena; Somer, Mehmet Suat; Researcher; Undergraduate Student; Faculty Member; Department of Chemistry; College of Sciences; College of Sciences; College of Sciences; N/A; N/A; 178882
    Transparent, dark orange Ba[Au(N-3)(4)](2) center dot 4 H2O was synthesized by reaction of Ba(N-3)(2) and AuCl3 or HAuCl4 in aqueous solution. The novel barium tetraazidoaurate(III) tetrahydrate crystallizes in the monoclinic space group Cc (no. 9) with a=1813.68(17) pm, b=1737.95(11) pm, c=682.04(8) pm and beta=108.849(4)degrees. The predominant structural features of Ba[Au(N-3)(4)](2) center dot 4 H2O are two crystallographically independent discrete anions [Au(N-3)(4)](-) with gold in a tetragonal planar coordination by nitrogen. Vibrational spectra show good agreement with those of other azidoaurates(III). Upon drying, this salt was shown to be a highly explosive material.
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    Transformation of reduced graphene aerogel-supported atomically dispersed iridium into stable clusters approximated as Ir-6 during ethylene hydrogenation catalysis
    (Elsevier, 2022) Zhao, Yuxin; Hoffman, Adam S.; Gates, Bruce C.; Bare, Simon R.; Department of Chemistry; Department of Chemical and Biological Engineering; N/A; N/A; N/A; Ünal, Uğur; Uzun, Alper; Öztulum, Samira Fatma Kurtoğlu; Yalçın, Kaan; Çağlayan, Hatice Pelin; Faculty Member; Faculty Member; PhD Student; Master Student; Master Student; Department of Chemistry; Department of Chemical and Biological Engineering;  Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM); College of Sciences; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 42079; 59917; 384798; N/A; N/A
    Transformation of atomically dispersed reduced graphene aerogel (rGA)-supported complexes, Ir-I(C2H4)(2)(+), with an iridium loading of 9.9 wt%, to form low-nuclearity clusters was investigated during ethylene hydrogenation catalysis. Continuous-scan X-ray absorption spectra demonstrate the formation of clusters well approximated as Ir-4 during reaction at 100 degrees C in flowing equimolar ethylene and H-2. The Ir-4 clusters transformed into clusters well approximated as Ir 6 when the feed molar ratio was switched to H-2: C2H4 = 2 and remained stable in pure H-2 at 100 degrees C. Catalyst performance data show that hydrogenation activity increased with metal nuclearity in the order of atomically dispersed iridium/rGA << Ir-4/rGA < Ir-6/ rGA. Continuous scan X-ray absorption data, complemented with aberration-corrected scanning transmission electron microscopy images, demonstrate that the supported clusters approximated as Ir-6 are stable even in H-2 at atmospheric pressure and 100 degrees C. These supported iridium clusters are among the ones having the highest metal loadings reported for a supported metal cluster catalyst.
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    Polyurethane synthesis revisited: effect of solvent and reaction conditions on prepolymer formation and polymer properties
    (American Chemical Society (ACS), 2014) N/A; Department of Chemistry; Department of Chemistry; Yıldırım, Armen; Yılgör, Emel; Yılgör, İskender; Master Student; Researcher; Faculty Member; Department of Chemistry; Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; College of Sciences; College of Sciences; College of Sciences; N/A; 40527; 24181
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    Influence of competitive hydrogen bonding between hard and soft segments on the properties of siloxane and polyether-based segmented copolymers.
    (Amer Chemical Soc, 1999) Department of Chemistry; Department of Chemistry; N/A; Yılgör, İskender; Burgaz, Engin; Metin, Burak; Yurtsever, İsmail Ersin; Yılgör, Emel; Faculty Member; Undergraduate Student; Undergraduate Student; Faculty Member; Researcher; Department of Chemistry; College of Sciences; College of Sciences; N/A; 24181; 17956; N/A; N/A; 40527
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    The CH-3 Sigma+ anion: inelastic rate coefficients from collisions with he at interstellar conditions
    (American Chemical Society (ACS), 2023) de la Fuente, Jorge Alonso; Sanz-Sanz, Cristina; Gonzalez-Sanchez, Lola; Wester, Roland; Gianturco, Francesco A.; Department of Chemistry; Yurtsever, İsmail Ersin; Faculty Member; Department of Chemistry; College of Sciences; 7129
    We present accurate ab initio calculations on several properties of a gas-phase system of interest in the interstellar medium (ISM), where the title molecular anion has been often surmised but not yet confirmed by observations. The CH-3 sigma+ constitutes the smallest term in the series of longer anionic polyynes which have been observed in the ISM (e.g., C4H-and several others). Hence, its dynamical behavior in collision with He atoms, one of the most abundant atoms in that environment, can provide quantitative indicators on the changes which can occur in the rotational state population of the title anion when driven by this collision dynamics. We therefore report an accurate evaluation of the full potential energy surface (PES) which acts between the molecular anion in its ground vibrational state and the He atom. The relevant inelastic scattering cross sections and the corresponding inelastic rate coefficients are then computed within a quantum treatment of the collisions. We find that the fairly small values of the final inelastic rate coefficients indicate state-changing processes by collisions to be inefficient paths for modifying the rotational state populations of this anion and therefore to aid its possible observation from direct radiative emission in the microwave region.
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    Silicone-urea copolymers with a gradient interphase between PDMS and urea
    (American Chemical Society (ACS), 2005) Sheth, J; Wilkes, G; Department of Chemistry; Department of Chemistry; Yılgör, İskender; Yılgör, Emel; Faculty Member; Researcher; Department of Chemistry; College of Sciences; College of Sciences; 24181; 40527
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    Time-dependent self-organization and morphology development in segmented polyurethanes
    (American Chemical Society (ACS), 2005) Uslu, Nergis; Özhalıcı, H; Ünsal, E; Guler, G; Wilkes, GL; Klinedinst, D; Department of Chemistry; Department of Chemistry; Department of Chemistry; Yılgör, İskender; Yılgör, Emel; Tezgel, Arife Özgül; Faculty Member; Researcher; Undergraduate Student; Department of Chemistry; College of Sciences; College of Sciences; College of Sciences; 24181; 40527; N/A
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    Mussel inspired coatings based on tannic acid and polyamines
    (American Chemical Society (ACS), 2017) Department of Chemistry; Department of Chemistry; N/A; Yılgör, İskender; Yılgör, Emel; Söz, Çağla Koşak; Faculty Member; Researcher; PhD Student; Department of Chemistry; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; 24181; 40527; N/A
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    PTMO based TPU/silica nanocomposites: preparation and properties
    (Amer Chemical Soc, 2012) Malay, Özge; Oğuz, Oğuzhan; Menceloğlu, Yusuf Z.; N/A; Department of Chemistry; Department of Chemistry; Söz, Çağla Koşak; Yılgör, Emel; Yılgör, İskender; PhD Student; Researcher; Faculty Member; Department of Chemistry; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; N/A; N/A; 24181
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    POLY 708-Photoluminescent rare-earth ion containing silicone copolymers
    (Amer Chemical Soc, 2006) Department of Chemistry; Department of Chemistry; N/A; Department of Physics; Yılgör, İskender; Yılgör, Emel; Demirbaş, Ümit; Sennaroğlu, Alphan; Kurt, Adnan; Tezgel, Arife Özgül; Faculty Member; Researcher; Master Student; Faculty Member; Teaching Faculty; Undergraduate Student; Department of Chemistry; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; College of Sciences; 24181; N/A; 20328; 23851
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