ORCID Profile
0000-0002-4023-0025
Current Organisation
Ibaraki Daigaku Rigakubu
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Publisher: Walter de Gruyter GmbH
Date: 10-09-2022
Abstract: C 9 H 17 N 3 , monoclinic, P 2 1 / c (no. 14), a = 9.5601(3) Å, b = 9.5210(3) Å, c = 10.7651(3) Å, β = 94.564(3)°, V = 976.75(5) Å 3 , Z = 4, R gt ( F ) = 0.0432, wR ref ( F 2 ) = 0.1223, T = 178(2) K.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4DT01978D
Abstract: Luminescent silver( i ) complexes of substituted halopyrazolate anions are either dimeric trinuclear or trinuclear structures held together with weak interactions.
Publisher: MDPI AG
Date: 29-04-2023
Abstract: Two complexes containing a soft sulfur-substituted tris(pyrazolyl)hydroborate ligand, namely [TlI(TmtBu)]2∙2H2O and [InIII(TmtBu)2](InCl4), where TmtBu is the tris(3-tert-butyl-2-sulfanylidene-1H-imidazol-1-yl)hydroborate anion, have been characterized. The {TlS}2 core of the former has the shape of a diamond. Each S atom of the TmtBu anion coordinates differently: one S is connected to one Tl atom, one bridges both Tl atoms, while the third S atom connects solely to the second Tl atom. The S4 donor set defines a seesaw geometry. The independent H2O molecule forms O–H···S and localized O–H···π(pyrazolyl) contacts. Flattened octahedral geometries defined by S6 donor sets are noted for the two independent cations in [InIII(TmtBu)2](InCl4). In the crystal of [TlI(TmtBu)]2∙2H2O, pyrazolyl-C–H···O(water) interactions connect the dimeric units into a linear supramolecular chain, chains pack without directional interactions between them. In the crystal of [InIII(TmtBu)2](InCl4), alternating rows of independent cations are interspersed by anions. The primary points of contact within a three-dimensional architecture are of the type In–Cl···π(pyrazolyl) and C–H···Cl. The assessment of the molecular packing was complemented by considering the calculated Hirshfeld surfaces and two-dimensional fingerprint plots (overall and delineated into in idual contacts).
Publisher: MDPI AG
Date: 24-03-2023
DOI: 10.3390/MOLECULES28072936
Abstract: Coordination polymers of transition metal ions are fascinating and important to coordination chemistry. One of the ligands known to form particularly interesting coordination polymers is 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (Me4bpzH2). Group 11 metal(I) ion coordination polymers, other than those of copper(I), are relatively easy to handle because of their low reactivity towards dioxygen and moisture. However, the known silver(I) coordination polymers often have poor solubility in common solvents and so cannot be easily analyzed in solution. By using a tetramethyl substituted bipyrazole ligand, we have synthesized more soluble silver(I) complexes that contain the trifluoromethyl group in the coordinated ions CF3CO2− and CF3SO3− in [Ag(CF3CO2)(Me4bpzH2)] and [Ag(CF3SO3)(Me4bpzH2)]. We determined both structures by single-crystal X-ray analysis at low temperatures and compared them in detail. Moreover, we investigated the solution behavior of these coordination polymers by 1H-NMR, IR, Raman, UV–Vis spectroscopies, and their low-temperature, solid-state photoluminescence. The high-energy band at ~330 nm corresponded to ligand-centered (bipyrazole) fluorescence, and the low-energy band at ~400 nm to ligand-centered phosphorescence resulting from the heavy atom effect.
Publisher: Walter de Gruyter GmbH
Date: 17-11-2021
Abstract: C 30 H 26 B 2 F 18 MnN 12 , triclinic, P 1 ‾ $P\\overline{1}$ (no. 2), a = 10.5322(3) Å, b = 10.6475(4) Å, c = 10.9890(4) Å, α = 111.755(3)°, β = 99.100(2)°, γ = 112.740(3)°, V = 988.07(7) Å 3 , Z = 1, R gt ( F ) = 0.0338, wR ref ( F 2 ) = 0.0907, T = 178 K.
Publisher: Walter de Gruyter GmbH
Date: 17-11-2021
Abstract: C 30 H 44 B 2 CuN 12 , triclinic, P 1 ‾ $P\\overline{1}$ (no. 2), a = 8.6801(1) Å, b = 10.1688(2) Å, c = 10.7290(2) Å, α = 62.672(2)°, β = 84.3550(10)°, γ = 78.9700(10)°, V = 825.71(3) Å 3 , Z = 1, R gt ( F ) = 0.0318, wR ref ( F 2 ) = 0.0961, T = 178 K.
Publisher: The Chemical Society of Japan
Date: 05-06-2020
DOI: 10.1246/CL.200081
Publisher: The Chemical Society of Japan
Date: 05-06-2019
DOI: 10.1246/CL.190145
Publisher: Walter de Gruyter GmbH
Date: 02-10-2020
Abstract: C 30 H 28 BClCuN 6 , triclinic, P 1 ‾ $P& #x203e {1}$ (no. 2), a = 11.549(3) Å, b = 12.321(3) Å, c = 12.348(4) Å, α = 111.785(1)°, β = 116.664(3)°, γ = 97.513(1)°, V = 1361.3(7) Å 3 , Z = 2, R gt ( F ) = 0.0440, wR ref ( F 2 ) = 0.1063, T = 197 K.
Publisher: Walter de Gruyter GmbH
Date: 05-10-2020
Abstract: C 20 H 30 BClCuN 8 , monoclinic, P 2 1 / c (no. 14), a = 17.1345(7) Å, b = 7.8207(2) Å, c = 19.0213(8) Å, β = 108.268(1)°, V = 2420.46(16) Å 3 , Z = 4, R gt ( F ) = 0.0322, wR ref ( F 2 ) = 0.0876, T = 184 K.
Publisher: Walter de Gruyter GmbH
Date: 15-08-2023
Abstract: C 26 H 36 N 6 , triclinic, P 1 ‾ $\\overline{1}$ (no. 2), a = 5.7137(2) Å, b = 10.4374(3) Å, c = 11.1141(3) Å, α = 104.980(3)°, β = 94.279(3)°, γ = 93.876(3)°, V = 635.89(3) Å 3 , Z = 1, R gt ( F ) = 0.0503, wR ref ( F 2 ) = 0.1220, T = 178 K.
Publisher: Walter de Gruyter GmbH
Date: 28-08-2020
Abstract: C 31 H 28 BCuN 6 O, monoclinic, P 2 1 / n (no. 14), a = 11.506(3) Å, b = 16.122(3) Å, c = 15.805(3) Å, β = 99.433(3)°, V = 2892.2(11) Å 3 , Z = 4, R gt ( F ) = 0.0501, wR ref ( F 2 ) = 0.1260, T = 193(2) K.
Publisher: Walter de Gruyter GmbH
Date: 16-08-2023
Abstract: C 18 H 20 N 6 ·2(CH 3 OH), triclinic, P 1 ‾ $P\\overline{1}$ (no. 2), a = 5.0063(2) Å, b = 8.5627(5) Å, c = 12.8216(6) Å, α = 77.898(4)°, β = 89.301(4)°, γ = 76.601(4)°, V = 522.40(5) Å 3 , Z = 1, R gt ( F ) = 0.0577, w R ref ( F 2 ) = 0.1642, T = 178 K.
Publisher: Walter de Gruyter GmbH
Date: 21-08-2023
Abstract: 2[C 5 H 10 N 3 ][C 8 F 4 O 4 ], monoclinic, P 2 1 / n (no. 14), a = 6.1490(2) Å, b = 11.0063(3) Å, c = 14.0214(3) Å, β = 94.386(5) ∘ , V = 946.16(5) Å 3 , Z = 2, R gt ( F ) = 0.0371, wR ref ( F 2 ) = 0.1127, T = 178 K.
Publisher: MDPI AG
Date: 17-11-2021
DOI: 10.3390/NANO11113101
Abstract: Cyclic trinuclear complexes with group 11 metal(I) ions are fascinating and important to coordination chemistry. One of the ligands known to form these cyclic trinuclear complexes is pyrazolate, which is a bridging ligand that coordinates many transition metal ions in a Npz–M–Npz linear mode (Npz = pyrazolyl nitrogen atom). In these group 11 metal(I) ions, copper is the most abundant metal. Therefore, polynuclear copper(I) complexes are very important in this field. The cyclic trinuclear copper(I) complex [Cu(3,5-Ph2pz)]3 (3,5-Ph2pz– = 3,5-diphenyl-1-pyrazolate anion) was reported in 1988 as a landmark complex, but its photoluminescence properties have hitherto not been described. In this study, we report the photoluminescence and two different polymorphs of [Cu(3,5-Ph2pz)]3 and its derivative [Cu(3-Me-5-Phpz)]3 (3-Me-5-Phpz– = 3-metyl-5-phenyl-1-pyrazale anion). The substituents in [Cu(3-Me-5-Phpz)]3 cause smaller distortions in the solid-state structure and a red-shift in photoluminescence due to the presence of intermolecular cuprophilic interactions.
Publisher: Walter de Gruyter GmbH
Date: 08-09-2022
Abstract: C 15 H 13 BF 9 N 7 NiO, orthorhombic, Pnma (no. 62), a = 17.8513(3) Å, b = 13.3869(2) Å, c = 8.5944(2) Å, V = 2053.83(7) Å 3 , Z = 4, R gt ( F ) = 0.0235, wR ref ( F 2 ) = 0.0690, T = 124(2) K.
Location: No location found
Location: Japan
No related grants have been discovered for Kiyoshi Fujisawa.