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Synthesis, Characterization, Catalytic Activity, and DFT Calculations of Zn(II) Hydrazone Complexes. Molecules 2020; 25:molecules25184043. [PMID: 32899683 PMCID: PMC7570652 DOI: 10.3390/molecules25184043] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 08/29/2020] [Accepted: 09/03/2020] [Indexed: 11/19/2022] Open
Abstract
Two new Zn(II) complexes with tridentate hydrazone-based ligands (condensation products of 2-acetylthiazole) were synthesized and characterized by infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy and single crystal X-ray diffraction methods. The complexes 1, 2 and recently synthesized [ZnL3(NCS)2] (L3 = (E)-N,N,N-trimethyl-2-oxo-2-(2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)ethan-1-aminium) complex 3 were tested as potential catalysts for the ketone-amine-alkyne (KA2) coupling reaction. The gas-phase geometry optimization of newly synthesized and characterized Zn(II) complexes has been computed at the density functional theory (DFT)/B3LYP/6–31G level of theory, while the highest occupied molecular orbital and lowest unoccupied molecular orbital (HOMO and LUMO) energies were calculated within the time-dependent density functional theory (TD-DFT) at B3LYP/6-31G and B3LYP/6-311G(d,p) levels of theory. From the energies of frontier molecular orbitals (HOMO–LUMO), the reactivity descriptors, such as chemical potential (μ), hardness (η), softness (S), electronegativity (χ) and electrophilicity index (ω) have been calculated. The energetic behavior of the investigated compounds (1 and 2) has been examined in gas phase and solvent media using the polarizable continuum model. For comparison reasons, the same calculations have been performed for recently synthesized [ZnL3(NCS)2] complex 3. DFT results show that compound 1 has the smaller frontier orbital gap so, it is more polarizable and is associated with a higher chemical reactivity, low kinetic stability and is termed as soft molecule.
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Nakanishi T, Hori Y, Sato H, Wu SQ, Okazawa A, Kojima N, Yamamoto T, Einaga Y, Hayami S, Horie Y, Okajima H, Sakamoto A, Shiota Y, Yoshizawa K, Sato O. Observation of Proton Transfer Coupled Spin Transition and Trapping of Photoinduced Metastable Proton Transfer State in an Fe(II) Complex. J Am Chem Soc 2019; 141:14384-14393. [PMID: 31422661 DOI: 10.1021/jacs.9b07204] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
An important technique to realize novel electron- and/or proton-based functionalities is to use a proton-electron coupling mechanism. When either a proton or electron is excited, the other one is modulated, producing synergistic functions. However, although compounds with proton-coupled electron transfer have been synthesized, crystalline molecular compounds that exhibit proton-transfer-coupled spin-transition (PCST) behavior have not been reported. Here, we report the first example of a PCST Fe(II) complex, wherein the proton lies on the N of hydrazone and pyridine moieties in the ligand at high-spin and low-spin Fe(II), respectively. When the Fe(II) complex is irradiated with light, intramolecular proton transfer occurs from pyridine to hydrazone in conjunction with the photoinduced spin transition via the PCST mechanism. Because the light-induced excited high-spin state is trapped at low temperatures in the Fe(II) complex-a phenomenon known as the light-induced excited-spin-state trapping effect-the light-induced proton-transfer state, wherein the proton lies on the N of hydrazone, is also trapped as a metastable state. The proton transfer was accomplished within 50 ps at 190 K. The bistable nature of the proton position, where the position can be switched by light irradiation, is useful for modulating proton-based functionalities in molecular devices.
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Affiliation(s)
- Takumi Nakanishi
- Institute for Materials Chemistry and Engineering & IRCCS , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Yuta Hori
- Institute for Materials Chemistry and Engineering & IRCCS , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan.,Center for Computational Sciences , University of Tsukuba , Tsukuba 305-8577 , Japan
| | - Hiroyasu Sato
- Rigaku Corporation , 3-9-12 Matsubaracho , Akishima , Tokyo 196-8666 , Japan
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering & IRCCS , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Atsushi Okazawa
- Department of Basic Science, Graduation School of Arts and Sciences , The University of Tokyo , 3-8-1 Komaba , Meguro-ku , Tokyo 153-8902 , Japan
| | - Norimichi Kojima
- Toyota Physical and Chemical Research Institute , Yokomichi, Nagakute , Aichi 480-1192 , Japan
| | - Takashi Yamamoto
- Department of Chemistry, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi, Kohoku-ku , Yokohama , Kanagawa 223-8522 , Japan
| | - Yasuaki Einaga
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami, Chuo-ku , Kumamoto 860-8555 , Japan
| | - Shinya Hayami
- Department of Chemistry, Faculty of Advanced Science and Technology , Kumamoto University , 2-39-1 Kurokami, Chuo-ku , Kumamoto 860-8555 , Japan.,Institute of Pulsed Power Science (IPPS) , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Yusuke Horie
- Graduate School of Science and Engineering , Aoyama Gakuin University , 5-10-1 Fuchinobe, Chuo-ku , Sagamihara , Kanagawa 252-5258 , Japan
| | - Hajime Okajima
- Graduate School of Science and Engineering , Aoyama Gakuin University , 5-10-1 Fuchinobe, Chuo-ku , Sagamihara , Kanagawa 252-5258 , Japan
| | - Akira Sakamoto
- Graduate School of Science and Engineering , Aoyama Gakuin University , 5-10-1 Fuchinobe, Chuo-ku , Sagamihara , Kanagawa 252-5258 , Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering & IRCCS , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering & IRCCS , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering & IRCCS , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka 819-0395 , Japan
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Romanović MČ, Čobeljić B, Pevec A, Turel I, Anđelković K, Milenković M, Radanović D, Belošević S, Milenković MR. Synthesis, crystal structures and antimicrobial activity of azido and isocyanato Zn(II) complexes with the condensation product of 2-quinolinecarboxaldehyde and Girard’s T reagent. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1343945] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | - Andrej Pevec
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia
| | - Iztok Turel
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia
| | | | - Marina Milenković
- Faculty of Pharmacy, Department of Microbiology and Immunology, University of Belgrade, Belgrade, Serbia
| | - Dušanka Radanović
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Belgrade, Serbia
| | - Svetlana Belošević
- Faculty of Technical Sciences, University of Priština, Kosovska Mitrovica, Serbia
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Vafazadeh R, Moghadas Z, Willis AC. Anion and solvent effects on the coordination behavior of N-(2-pyridinylmethylene)benzoylhydrazone with copper(II): synthesis and structural characterization. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1096349] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | | | - Anthony C. Willis
- Research School of Chemistry, Australian National University, Canberra, Australia
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Sithambaresan M, Kurup MRP. 2-(3-Eth-oxy-2-hy-droxy-benz-ylidene)-N-phenyl-hydrazinecarboxamide. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o2972. [PMID: 22219994 PMCID: PMC3247376 DOI: 10.1107/s1600536811041857] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 10/11/2011] [Indexed: 11/13/2022]
Abstract
The title compound, C16H17N3O3, exists in the E configuration with respect to the azomethine double bond. The molecule is close to planar, with a dihedral angle of 6.7 (1)° between the aromatic rings. The phenolic O atom functions as donor and acceptor by forming intramolecular O—H⋯O and intermolecular N—H⋯O hydrogen bonds, respectively. Two-dimensional packing is fashioned through an intermolecular hydrogen bonding network in an offset manner.
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Reena TA, Kurup MRP. Copper(II) complexes derived from di-2-pyridyl ketone-N(4)-phenyl-3-semicarbazone: Synthesis and spectral studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 76:322-327. [PMID: 20457004 DOI: 10.1016/j.saa.2010.03.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Revised: 02/27/2010] [Accepted: 03/15/2010] [Indexed: 05/29/2023]
Abstract
Five copper(II) complexes [CuLCl](2).CuCl(2).4H(2)O (1), [CuLOAc] (2), [CuLNO(3)](2) (3), [CuLN(3)] (4) and [CuLNCS].3/2H(2)O (5) of di-2-pyridyl ketone-N(4)-phenyl-3-semicarbazone (HL) were synthesized and characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired electron. EPR spectra of all the complexes in DMF at 77K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures.
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Affiliation(s)
- T A Reena
- Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682 022, Kerala, India
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