Publications by authors named "Sang Woo Kwak"

Canine mammary carcinoma (CMC) is the most common type of neoplasm in intact female dogs. While a previous study in Western countries validated the 2011 classification as an independent prognostic indicator in CMC, its role in CMC prognostication in Asian countries such as Korea remains unclear. In the present study, we estimate the survival rates in CMC types defined by the 2011 classification, elucidate the prognostic significance of the histological subtype and grade and that of the lymphatic invasion status in CMC, and validate the 2011 classification as an independent prognostic indicator in a large cohort of CMCs (excluding cases of multicentric CMCs).

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A novel class of quinolinol-based dimeric indium complexes (-) was synthesized and characterized using H and C(H) NMR spectroscopy and elemental analysis. Compounds - exhibited typical low-energy absorption bands assignable to quinolinol-centered π-π* charge transfer (CT) transition. The emission spectra of - exhibited slight bathochromic shifts with increasing solvent polarity (-xylene < tetrahydrofuran (THF) < dichloromethane (DCM)).

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Novel carbazole-conjugated salen-In complexes ( and ) were prepared and fully characterized by H and C NMR spectroscopy, elemental analysis, and high-resolution mass spectrometry. The major low-energy absorption bands at λ = 342 nm for and 391 nm for , respectively, are assigned to typical intramolecular charge transfer (ICT) transitions between the carbazole unit and the salen-In center. The solvatochromism effects in various organic solvents and their large Stokes shift distinctly supported the ICT nature.

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An approach to the design of a series of quinolinol-based indium complexes that can exhibit different optical properties is proposed. Mono-incorporated (Inq and InMeq), bis-incorporated (InMeq), and tris-incorporated (Inq and InMeq) indium quinolinate complexes have been prepared. These complexes have also been characterized by X-ray crystallography.

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A series of triphenylamine (TPA)-containing salen-Al assembly dyads, [salen(3- tBu-5-R)Al(OCH- p-N(CH))] [salen = N, N'-bis(salicylidene)ethylenediamine; R = H (D1), tBu (D2), Ph (D3), OMe (D4), and NMe (D5)], were prepared in good yield (50-80%) and fully characterized by NMR spectroscopy and elemental analysis. Both the UV/vis absorption and photoluminescence (PL) spectra of D1-D4, except for D5, in a tetrahydrofuran solution exhibited dual patterns, which are assignable to the salen-Al-centered π-π* transition (low-energy region) and the TPA-centered π-π* transition (high-energy region). In particular, the emission spectra of the dyads displayed interesting dual-emissive patterns via a significant intramolecular energy transfer (IET) process between the salen-Al moiety and TPA group.

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A novel class of salen-Al/carbazole dyads (D1 and D2) was synthesized and fully identified. The emission spectra of the dyads presented intriguing dual-emission patterns via an intramolecular energy transfer (IET) state in solution. Furthermore, the IET feature of the dyads was clearly observed in the rigid state.

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Salen-based indium triads, [{(3-tBu)2-(5-Mes2B)2-salen}In-Me] (1) and [{(3-tBu)2-(5-Mes2Bphenyl)2-salen}In-Me] (2), bearing triarylborane (TAB) units were prepared and fully characterised by NMR spectroscopy and elemental analysis. The major absorption bands of 1 and 2 appeared in the region centred at 347 nm and 374 nm, respectively, and the intense emission spectra were observed in the sky blue (λem = 491 nm for 1) and bluish-green (λem = 498 nm for 2) regions, respectively. The solvatochromism effects in various organic solvents and computational calculation results strongly suggested that these absorption and emission features are mainly attributed to intramolecular charge transfer (ICT) transitions between the salen ligand moieties and the TAB units.

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Novel salen-Al/triarylborane dyad complexes were prepared and characterized with their corresponding mononuclear compounds. The UV-vis and photoluminescence experiments for dyads exhibited photoinduced energy transfer from borane to the salen-Al moiety in an intramolecular manner. Theoretical calculation and fluoride titration results further supported these intramolecular energy-transfer features.

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The series of novel salen-based indium complexes (3-Bu-5-R-salen)In-Me (3-Bu-5-R-salen = N,N'-bis(2-oxy-3-tert-butyl-5-R-salicylidene)-1,2-diaminoethane, R = H (1), Bu (2), Br (3), Ph (4), OMe (5), NMe (6)) and [(3-Bu-5-NMe-salen)In-Me](OTf) (7; OTf = CFSO) have been synthesized and fully characterized by NMR spectroscopy and elemental analysis. All indium complexes 1-7 are highly stable in air and even aqueous solutions. The solid-state structures for 3-5, which were confirmed by single-crystal X-ray analysis, exhibit square-pyramidal geometries around the indium center.

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Hepatitis A virus (HAV) is the leading cause of acute viral hepatitis worldwide, with HAV infection being restricted to humans and nonhuman primates. In this study, HAV infection status was serologically determined in domestic pigs and experimental infections of HAV were attempted to verify HAV infectivity in pigs. Antibodies specific to HAV or HAV-like agents were detected in 3.

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Synopsis of recent research by authors named "Sang Woo Kwak"

  • - Sang Woo Kwak's research primarily explores two distinct fields: veterinary oncology focusing on canine mammary carcinomas, and materials science concerning photophysical properties of indium complexes.
  • - In the veterinary domain, his study validates the 2011 histological classification of canine mammary carcinoma as a significant prognostic indicator, highlighting survival rates based on subtype, grade, and lymphatic invasion status in a cohort of 155 cases.
  • - In materials science, Kwak has synthesized and characterized various indium-based complexes with unique photophysical properties, demonstrating features like intramolecular energy transfer and dual-emission characteristics, which hold potential for applications in luminescent materials.