S. Karasawa

发表

Formation of monometallic single-molecule magnets with an Stotal value of 3/2 in diluted frozen solution.

M. Nakano, S. Karasawa, Daisuke Yoshihara, 2008, Dalton transactions.

Water‐proton relaxivities of DNA oligomers carrying TEMPO radicals

Yuichiro Sato, S. Karasawa, N. Koga, 2008, Magnetic resonance in chemistry : MRC.

Two-step transformation of p -anisolylaminoquinoline derivatives induced by conformation- and packing-dominated processes

Kazuteru Usui, S. Karasawa, Ryusuke Hagihara, 2017 .

Development of Functional Nanoparticles and Their Systems Capable of Accumulating to Tumors

S. Karasawa, 2019, Molecular Technology.

Photophysical Properties of Emissive Pyrido[3,2-c]carbazole Derivatives and Apoptosis Induction: Development towards Theranostic Agents in Response to Light Stimulus.

Kazuteru Usui, S. Karasawa, Masaomi Sakuma, 2019, Chemistry, an Asian journal.

Fluorescence Tumor-Imaging Using a Thermo-Responsive Molecule with an Emissive Aminoquinoline Derivative

I. Aoki, Ken‐ichi Yamada, S. Karasawa, 2018, Nanomaterials.

Determination of the absolute configuration of the novel anti-trypanosomal iridoid molucidin isolated from Morinda lucida by X-ray analysis

D. Boakye, S. Yamaoka, I. Tuffour, 2015 .

Development of Turn-On Probes for Acids Triggered by Aromaticity Enhancement Using Tricyclic Amidine Derivatives.

Go Hirai, Kazuteru Usui, S. Karasawa, 2019, The Journal of organic chemistry.

Heterospin single-molecule magnet behaviors after irradiation of polymorphous 2:2 cyclic diazo-cobalt(II) complexes

S. Karasawa, Daisuke Yoshihara, N. Koga, 2015 .

Polymorphic equilibrium responsive thermal and mechanical stimuli in light-emitting crystals of N-methylaminonaphthyridine.

Yui Abe, S. Karasawa, N. Koga, 2012, Organic letters.

One-, Two-, and Three-Dimensional Heterospin Complexes Consisting of 4-(N-tert-Butyloxylamino)pyridine (4NOpy), Dicyanamide Ion (DCA), and 3d Metal Ions: Crystal Structures and Magnetic Properties of [M(II)(4NOpy)x(DCA)y(CH3CN)z]n (M = Mn, Co, Ni, Cu, Zn).

S. Karasawa, N. Koga, Hiraku Ogawa, 2016, Inorganic chemistry.

Regioselective Photocyclizations of Di(quinolinyl)arylamines and Tri(quinolinyl)amine with Emission Color Changes and Photoreaction-Induced Self-Assemblies.

K. Yoza, Kazuteru Usui, S. Karasawa, 2016, Chemistry.

Magnetic properties of 1 : 4 complexes of CoCl2 and pyridines carrying carbenes (S(0) = 4/2, 6/2, and 8/2) in diluted frozen solution; influence of carbene multiplicity on heterospin single-molecule magnets.

S. Karasawa, N. Koga, N. Yamamoto, 2012, Dalton transactions.

Magnetic properties after irradiation of 1:4 complexes consisting of CoX2, X=NCS⁻, Cl⁻, and NCO⁻, and phenylpyridyldiazomethane in dilute frozen solutions: axial ligand effect in heterospin single-molecule magnets.

S. Karasawa, N. Koga, 2011, Inorganic chemistry.

π‐Extended Push‐Pull‐Type Bicyclic Fluorophores Based on Quinoline and Naphthyridine Frameworks with an Iminophosphorane Fragment

Tomohiro Umeno, Kazuteru Usui, S. Karasawa, 2021, Asian Journal of Organic Chemistry.

High-Z′ Crystal Structure of Tricyclic Imidazonaphthyridine Derivatives and the Thermal Profiles of Their Polymorphs

Tomohiro Umeno, Kazuteru Usui, S. Karasawa, 2021, Crystal Growth & Design.

Push-Pull Bisnaphthyridylamine Supramolecular Nanoparticles: Polarity-Induced Aggregation- and Crystallization-Induced Emission Enhancement and Fluorescence Resonance Energy Transfer.

Tomohiro Umeno, Ken‐ichi Yamada, Kazuteru Usui, 2020, Chemistry.

Fluorescence Properties and Exciplex Formation of Emissive Naphthyridine Derivatives: Applications as Sensors for Individual Amine Species.

Kazuteru Usui, S. Karasawa, Ryusuke Hagihara, 2019, Chemistry.

Influence of diamagnetic chelating ligand (L) on spin exchange coupling in heterospin chain complexes, [Cu(L)2NOpy2]n

K. Yoza, S. Karasawa, N. Koga, 2013 .

3- and 4-(α-diazobenzyl)pyridine-N-oxides as photoresponsive magnetic couplers for 2p-4f heterospin systems: formation of carbene-Tb(III) and carbene-Dy(III) single-molecule magnets.

K. Yoza, Y. Inagaki, S. Karasawa, 2016, Dalton transactions.

Crystalline transformations of dinaphthyridinylamine derivatives with alteration of solid-state emission in response to external stimuli

S. Karasawa, N. Koga, Ryusuke Hagihara, 2015 .

Magnetic behaviors of cobalt(II) complex chains connected with a 1,3-phenylenebis(4-pyridylcarbene) magnetic coupler

S. Karasawa, Daisuke Yoshihara, N. Koga, 2013 .

Heterospin single-molecule magnets with extra-large anisotropic barrier

S. Karasawa, Daisuke Yoshihara, N. Koga, 2011 .

Radiosynthesis and preliminary biodistribution in mice of 6‐deoxy‐6‐[131I]iodo‐L‐ascorbic acid

Jintaek Kim, F. Yamamoto, M. Maeda, 2009 .

Crystal structures and magnetic properties of complexes of M(NO3)2; M = MnII, CoII, NiII, and CuII, with pyridine ligands carrying an aminoxyl radical

S. Karasawa, N. Koga, Zhichen Zhu, 2005 .

A fully synthetic 6-aza-artemisinin bearing an amphiphilic chain generates aggregates and exhibits anti-cancer activities.

H. Seimiya, H. Oguri, Y. Muramatsu, 2020, Organic & biomolecular chemistry.

Isolation and crystal structure of a peroxo-bridged heme-copper complex.

F. Tani, S. Hayami, Y. Naruta, 2003, Angewandte Chemie.

Water-Proton Relaxivities of Radical Nanoparticles Self-Assembled via Hydration or Dehydration Processes.

I. Aoki, Go Hirai, Kazuteru Usui, 2017, Langmuir : the ACS journal of surfaces and colloids.

Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine]copper(II) in a frozen solution

H. Morikawa, S. Karasawa, N. Koga, 2003 .

Magnetic behaviors after irradiation of assemblies consisting of bis(hexafluoroacetylacetonato)copper(II) and tetrapyridyl-pentadiazo compound in frozen solution

S. Karasawa, N. Koga, 2003 .

Photochemical formations of super high-spin molecules consisting of carbenes and metal ions in frozen solutions

S. Karasawa, N. Koga, 2001 .

2,2'-Bipyridines carrying a diazomoiety and their complexes with bis(hexafluoroacetylacetonato)copper:synthesis, structures, electronic and magnetic properties of their photoproductsin frozen solutions

T. Itoh, H. Morikawa, S. Karasawa, 2001 .

Characterization and Water-Proton Longitudinal Relaxivities of Liposome-Type Radical-Nanoparticles Prepared by a Supramolecular Approach.

Ken‐ichi Yamada, Kazuteru Usui, S. Karasawa, 2020, Langmuir : the ACS journal of surfaces and colloids.

Effects of Substituents on the Properties of Metal-Free MRI Contrast Agents

Go Hirai, Ken‐ichi Yamada, Kazuteru Usui, 2019, ACS omega.

Self-Assembled Biradical Ureabenzene Nanoparticles for Magnetic Resonance Imaging

I. Aoki, Go Hirai, S. Karasawa, 2018, ACS Applied Nano Materials.

Rational syntheses of helical π-conjugated oligopyrrins with a bipyrrole linkage: geometry control of bis-copper(II) coordination.

Weihua Zhu, Sihai Yang, Mathew Savage, 2016, Chemical communications.

Crystal design of monometallic single-molecule magnets consisting of cobalt-aminoxyl heterospins.

Shinji Kanegawa, M. Nakano, S. Karasawa, 2008, Journal of the American Chemical Society.

Syntheses and electronic structures of one-electron-oxidized group 10 metal(II)-(disalicylidene)diamine complexes (metal = Ni, Pd, Pt).

F. Tani, Y. Naruta, Kôichi Fukui, 2007, Journal of the American Chemical Society.

Photochemical formation of ferrimagnetic chains from a pair of polymeric complexes made of octahedral bis(hexafluoroacetylacetonato)manganese(II) with diazodi(4-pyridyl)methane in the cis and trans configurations as repeating units

T. Itoh, P. Rabu, M. Drillon, 1998 .

New insights into the electronic structure and reactivity of one-electron oxidized copper(II)-(disalicylidene)diamine complexes.

F. Thomas, F. Tani, T. Storr, 2012, Inorganic chemistry.

Synthesis and characterization of imidazolate-bridged polynuclear copper complexes

F. Tani, Y. Naruta, M. Nakano, 2007 .

Stable π Radical from a Contracted Doubly N-Confused Hexaphyrin by Double Palladium Metalation.

Dongho Kim, H. Furuta, Shigeki Mori, 2015, Angewandte Chemie.

Asymmetric spirocyclization: A new type of acid-catalyzed intramolecular 1, 4-addition to form carba-spirocyclic compounds

S. Karasawa, M. Aso, H. Suemune, 1998 .

Preparations, crystal structures, and magnetic properties of N,N-dipyridylaminoxyl as a new magnetic coupler and its one-dimensional cobalt(II) chains.

Shinji Kanegawa, Y. Inagaki, S. Karasawa, 2012, Inorganic chemistry.

Magnetic Properties of 1:4 Complexes of CoIIX2 (X = NCO-, NCS-, and Br-) with 4-(N-tert-Butylaminoxyl)pyridine. Antiferromagnets in Crystalline States and Single-Molecule Magnets in Frozen Solutions

Shinji Kanegawa, M. Nakano, S. Karasawa, 2006 .

7-Hydroxy-3-methyleneisoindolin-1-one as a New ESIPT-Fluorescent Probe to Monitor Aqueous Environments.

Go Hirai, Kazuteru Usui, S. Karasawa, 2017, Chemical & pharmaceutical bulletin.

Preparation of 5-trimethylsilyl-1,3-phenylenebis[diazo(4-pyridyl)methane] and magnetic properties of its 1:1 copper(ii) complex after photolysis

Masakazu Tanaka, S. Karasawa, N. Koga, 1997 .

Crystal structures and magnetic properties of complexes of M(II)Cl2 (M = Cu, Ni, and Co) coordinated with 4-(N-tert-butyloxyamino)-2-(methoxymethylenyl)pyridine: 2D magnetic anisotropy of the aminoxyl-Co(II) complex in the crystalline state.

S. Karasawa, N. Koga, Zhichen Zhu, 2005, Inorganic chemistry.

Molecule-Based Magnets in Heterospin Systems

S. Karasawa, N. Koga, 2005 .

Molecular structures and magnetic properties of the mixed-ligand complexes of bis(hexafluoroacetylacetonato)manganese(II), -copper(II), and -zinc(II) with 4,4'-bis(N-tert-butyl-N-oxylamino)-2,2'-bipyridine. Isosceles triangular hetero-three-spin systems consisting of aminoxyls and metal ions.

S. Karasawa, N. Koga, H. Iwamura, 2000, Inorganic chemistry.

Magnetic properties of 1:2 mixed cobalt(II) salicylaldehyde Schiff-base complexes with pyridine ligands carrying high-spin carbenes (Scar = 2/2, 4/2, 6/2, and 8/2) in dilute frozen solutions: role of organic spin in heterospin single-molecule magnets.

Y. Inagaki, S. Karasawa, Daisuke Yoshihara, 2014, Inorganic chemistry.

Cyclic single-molecule magnet in heterospin system.

S. Karasawa, Daisuke Yoshihara, N. Koga, 2008, Journal of the American Chemical Society.

Magnetic behavior of tetrakis[4-(N-tert-butyl-N-oxylamino)pyridine]bis(isocyanato-N)cobalt(II) in frozen solution.

Shinji Kanegawa, M. Nakano, S. Karasawa, 2004, Chemical communications.

Internal-Edge-Substituted Coumarin-Fused [6]Helicenes: Asymmetric Synthesis, Structural Features, and Control of Self-Assembly.

Kazunobu Igawa, K. Tomooka, A. Ojida, 2018, Chemistry.

Nickel(II)-phenoxyl radical complexes: structure-radical stability relationship.

S. Hirota, Y. Naruta, O. Yamauchi, 2004, Inorganic chemistry.

Protonation-induced formation of a stable singlet biradicaloid derived from a modified sapphyrin analogue.

F. Tani, Y. Naruta, H. Uno, 2010, Angewandte Chemie.

Crystal Structures, Thermal Properties, and Emission Behaviors of N,N-R-Phenyl-7-amino-2,4-trifluoromethylquinoline Derivatives: Supercooled Liquid-to-Crystal Transformation Induced by Mechanical Stimuli

Yui Abe, S. Karasawa, N. Koga, 2014 .

Crystal structures and emitting properties of trifluoromethylaminoquinoline derivatives: thermal single-crystal-to-single-crystal transformation of polymorphic crystals that emit different colors.

Yui Abe, S. Karasawa, N. Koga, 2012, Chemistry.

Basic Fluorescent Protonation-Type pH Probe Sensitive to Small ΔpKa of Methanol and Ethanol.

Tomohiro Umeno, S. Karasawa, Shota Matsumoto, 2022, Analytical chemistry.

Effect of Hydrophobicity on the Self-Assembly Behavior of Urea Benzene Derivatives in Aqueous Solution

Yuna Okamoto, Kosuke Morishita, Yasufumi Fuchi, 2018, Applied Sciences.

Self-Assembly Behavior of Emissive Urea Benzene Derivatives Enables Heat-Induced Accumulation in Tumor Tissue.

I. Aoki, Kazuteru Usui, S. Karasawa, 2017, Nano letters.

Thermal- and pH-Dependent Size Variable Radical Nanoparticles and Its Water Proton Relaxivity for Metal-Free MRI Functional Contrast Agents.

I. Aoki, S. Karasawa, Takeru Araki, 2016, The Journal of organic chemistry.

Assemblies of functional small-sized molecules having 4-amino-2,2,6,6-tetramethylpiperidine-1-oxyl responsive to heat and pH in water and their water proton relaxivities.

S. Karasawa, N. Koga, Hiroyuki Hayashi, 2011, Langmuir : the ACS journal of surfaces and colloids.

Doubly N-Confused [36]Octaphyrin(1.1.1.1.1.1.1.1): Isomerization, Bis-Metal Coordination, and Topological Chirality.

T. Yoshino, H. Furuta, Shigeki Mori, 2017, Angewandte Chemie.

Bis-Copper(II)/π-Radical Multi-Heterospin System with Non-innocent Doubly N-Confused Dioxohexaphyrin(1.1.1.1.1.0) Ligand.

Tomoyasu Hirai, Tomoki Uchiyama, M. Nishibori, 2017, Chemistry.

Characterization of push-pull-type benzo[X]quinoline derivatives (X = g or f): environmentally responsive fluorescent dyes with multiple functions.

Tomohiro Umeno, Yui Abe, R. Yamasaki, 2020, The Journal of organic chemistry.

Excited quartet and doublet states in the complex of tetraphenylporphine zinc (II) and a nitroxide radical in solution: X- and W-band time-resolved EPR studies

J. Fujisawa, S. Yamauchi, S. Weber, 2001 .

Stabilization of p-Phenylenebis(N-tert-butylaminoxyl) Relative to p-Benzoquinonediimine N,N'-Dioxide.

S. Karasawa, N. Koga, H. Iwamura, 1998, Angewandte Chemie.

Thermal Single Crystal to Single Crystal Transformation among Crystal Polymorphs in 2-Dimethylamino-5,7-bis(trifluoromethyl)-1,8-naphthyridine and in a 1-Quinoline Analogue

Taisuke Matsumoto, S. Karasawa, N. Koga, 2013 .

Diazopyridine–Ni(II) complexes exhibiting intra-chain ferromagnetic interaction after irradiation: formation of magnetic gel

S. Karasawa, N. Koga, Koya Mori, 2015 .

Water‐proton relaxivity of hyperbranched polymers carrying TEMPO radicals

A. Tanaka, K. Chikama, Keisuke Odoi, 2009, Magnetic resonance in chemistry : MRC.

Magnetic properties of tetrakis[4-(alpha-diazobenzyl)pyridine]bis(thiocyanato-N)cobalt(II) in frozen solution after irradiation. Formation of a single-molecule magnet in frozen solution.

H. Morikawa, Guang-Pei Zhou, S. Karasawa, 2003, Journal of the American Chemical Society.

Magnetic behavior of a 3:2 mixture of bis(hexafluoroacetylacetonato)copper(II) and 1,3,5-benzenetriyltris(4-pyridyldiazomethane) in a frozen solution after irradiation: photochemical formation of a solid solution magnet.

S. Karasawa, N. Koga, H. Iwamura, 2001, Journal of the American Chemical Society.

Unexpectedly large water-proton relaxivity of TEMPO incorporated into micelle-oligonucleotides

I. Aoki, Nobuhiro Nitta, S. Karasawa, 2013 .

Selective synthesis of substituted amino-quinoline derivatives by C-H activation and fluorescence evaluation of their lipophilicity-responsive properties

A. Mizutani, S. Karasawa, Ryusuke Hagihara, 2019, Scientific Reports.

Quantitative and Nondestructive Colorimetric Amine Detection Method for the Solid-Phase Peptide Synthesis as an Alternative to the Kaiser Test.

Tomohiro Umeno, S. Karasawa, Shota Matsumoto, 2023, Analytical chemistry.