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Sinapic Acid Co-Amorphous Systems with Amino Acids for Improved Solubility and Antioxidant Activity. Int J Mol Sci 2023; 24:ijms24065533. [PMID: 36982605 PMCID: PMC10053217 DOI: 10.3390/ijms24065533] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 03/11/2023] [Accepted: 03/12/2023] [Indexed: 03/17/2023] Open
Abstract
The objective of this study was to obtain co-amorphous systems of poorly soluble sinapic acid using amino acids as co-formers. In order to assess the probability of the interaction of amino acids, namely, arginine, histidine, lysine, tryptophan, and proline, selected as co-formers in the amorphization of sinapic acid, in silico studies were carried out. Sinapic acid systems with amino acids in a molar ratio of 1:1 and 1:2 were obtained using ball milling, solvent evaporation, and freeze drying techniques. X-ray powder diffraction results confirmed the loss of crystallinity of sinapic acid and lysine, regardless of the amorphization technique used, while remaining co-formers produced mixed results. Fourier-transform infrared spectroscopy analyses revealed that the co-amorphous sinapic acid systems were stabilized through the creation of intermolecular interactions, particularly hydrogen bonds, and the potential formation of salt. Lysine was selected as the most appropriate co-former to obtain co-amorphous systems of sinapic acid, which inhibited the recrystallization of sinapic acid for a period of six weeks in 30 °C and 50 °C. Obtained co-amorphous systems demonstrated an enhancement in dissolution rate over pure sinapic acid. A solubility study revealed a 12.9-fold improvement in sinapic acid solubility after introducing it into the co-amorphous systems. Moreover, a 2.2-fold and 1.3-fold improvement in antioxidant activity of sinapic acid was observed with respect to the ability to neutralize the 2,2-diphenyl-1-picrylhydrazyl radical and to reduce copper ions, respectively.
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Liu LL, Wang LX, Peng M, Xiang J, Yang H, Yiu SM, Lau TC. Ring Nitrogenation of Aromatic Amines by the Excited State of an Osmium(VI) Nitrido Complex. Inorg Chem 2023; 62:1447-1454. [PMID: 36633522 DOI: 10.1021/acs.inorgchem.2c03514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The reactivity of electrophilic OsVI and RuVI nitrides toward various aliphatic and aromatic amines have been previously reported; these reactions all go through an initial nucleophilic addition of the amine nitrogen to MVI≡N (M = Os, Ru) to generate a MIV hydrazido species. Herein, we report that the excited state of a luminescent osmium(VI) nitrido complex, [OsVI(N)(L)(CN)3]- (OsN, HL = 2-(2-hydroxy-5-nitrophenyl)benzoxazole), undergoes unprecedented ring nitrogenation of aromatic amines. Visible-light irradiation of OsN generates OsN*, which predominantly attacks the aromatic ring of 2,6-dimethylaniline (Me2PhNH2) to give an Os(II) benzoquinone diimine compound (PPh4)[OsII(L)(CN)3(p-NH═Me2Ph═NH2)] [(PPh4)2] in 60% yield, while nucleophilic addition of the amine N to OsN* also occurs to give the osmium(II) diazonium compound (PPh4)[OsII(L)(CN)3(N = N-Me2Ph)] [(PPh4)1] as a minor product (10% yield). On the other hand, OsN* undergoes exclusive ring nitrogenation of diphenylamine, indole, and carbazole to give the corresponding osmium(II) benzoquinone diimines. All products have been characterized by various spectroscopic techniques and by X-ray crystallography. The reaction between OsN* and Ar2N is proposed to proceed via an initial 1e- transfer (ET) followed by proton transfer (PT) to generate OsVNH and Ar2N• intermediates, which then further combine to give the product. The benzoquinone diimine ligands are susceptible to oxidation. Oxidation of 2 with H2O2 at ambient conditions affords [OsIV(L)(CN)3(N═PhMe2(O)═O)]-, which bears the previously unknown (epoxy)benzoquinone iminato ligand.
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Affiliation(s)
- Lu-Lu Liu
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, China
| | - Li-Xin Wang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, China
| | - Min Peng
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, China
| | - Jing Xiang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, China
| | - Huan Yang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong 999077, Hong Kong, China
| | - Tai-Chu Lau
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong 999077, Hong Kong, China
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New Guanidinium and Aminoguanidinim Salts of 2-Hydroxypyridine-3-carboxylic acid: Preparation and Spectral, Structural, Thermal, ADMET, Biological, and Molecular Docking Studies. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Xiang J, Zhu J, Zhou M, Liu LL, Wang LX, Peng M, Hou BS, Yiu SM, To WP, Che CM, Lau KC, Lau TC. Oxidative C–O bond cleavage of dihydroxybenzenes and conversion of coordinated cyanide to carbon monoxide using a luminescent Os( vi) cyanonitrido complex. Chem Commun (Camb) 2022; 58:7988-7991. [DOI: 10.1039/d2cc03002k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photoreactions of OsN and dihydroxybenzenes lead to C–O bond cleavage of H2Q/H2Cat, accompanied by the conversion of the coordinated CN− into CO.
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Affiliation(s)
- Jing Xiang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434020, Hubei, P. R. China
- State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Rd., Hong Kong, China
| | - Jiang Zhu
- State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Rd., Hong Kong, China
| | - Miaomiao Zhou
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue, Kowloon Tong, Hong Kong, China
| | - Lu-Lu Liu
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434020, Hubei, P. R. China
| | - Li-Xin Wang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434020, Hubei, P. R. China
| | - Min Peng
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434020, Hubei, P. R. China
| | - Bi-Shun Hou
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, 434020, Hubei, P. R. China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue, Kowloon Tong, Hong Kong, China
| | - Wai-Pong To
- State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Rd., Hong Kong, China
| | - Chi-Ming Che
- State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Rd., Hong Kong, China
| | - Kai-Chung Lau
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue, Kowloon Tong, Hong Kong, China
| | - Tai-Chu Lau
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue, Kowloon Tong, Hong Kong, China
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Chakraborty M, Mohanty M, Dinda R, Sengupta S, Kumar Chattopadhyay S. Cu(II) complexes of a bio-compatible aminoguanidine Schiff base: Histidine sensing and DNA-binding studies. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115554] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Xiang J, Peng M, Pan Y, Luo LJ, Cheng SC, Jin XX, Yiu SM, Man WL, Ko CC, Lau KC, Lau TC. Visible light-induced oxidative N-dealkylation of alkylamines by a luminescent osmium(vi) nitrido complex. Chem Sci 2021; 12:14494-14498. [PMID: 34881000 PMCID: PMC8580045 DOI: 10.1039/d1sc04369b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/08/2021] [Indexed: 01/15/2023] Open
Abstract
N-Dealkylation of amines by metal oxo intermediates (M
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O) is related to drug detoxification and DNA repair in biological systems. In this study, we report the first example of N-dealkylation of various alkylamines by a luminescent osmium(vi) nitrido complex induced by visible light. The visible light-induced N-dealkylation of various alkylamines by a luminescent osmium(vi) nitrido complex has been investigated. We provide definitive evidence that these reactions occur via an ET/PT mechanism.![]()
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Affiliation(s)
- Jing Xiang
- College of Chemistry and Environmental Engineering, Yangtze University Jingzhou 434020 Hubei P. R. China
| | - Min Peng
- College of Chemistry and Environmental Engineering, Yangtze University Jingzhou 434020 Hubei P. R. China
| | - Yi Pan
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong China
| | - Li-Juan Luo
- College of Chemistry and Environmental Engineering, Yangtze University Jingzhou 434020 Hubei P. R. China
| | - Shun-Cheung Cheng
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong China
| | - Xin-Xin Jin
- College of Chemistry and Environmental Engineering, Yangtze University Jingzhou 434020 Hubei P. R. China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong China
| | - Wai-Lun Man
- Department of Chemistry, Hong Kong Baptist University Kowloon Tong Hong Kong 999077 People's Republic of China
| | - Chi-Chiu Ko
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong China
| | - Kai-Chung Lau
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong China
| | - Tai-Chu Lau
- Department of Chemistry, City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong China
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Astakhov AV, Tarasova EV, Chernysheva AV, Rybakov VB, Starikova ZA, Chernyshev VM. Tautomerism and basicity of carboxylic acid guanyl hydrazides (acylaminoguanidines). Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3246-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Synthesis and crystal structures of arylamidine Ru(III) compounds containing a tetradentate Schiff base ligand from a amine-amine coupling reaction. INORG CHEM COMMUN 2021. [DOI: 10.1016/j.inoche.2020.108361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pursuwani BH, Bhatt BS, Vaidya FU, Pathak C, Patel MN. Fluorescence, DNA Interaction and Cytotoxicity Studies of 4,5-Dihydro-1H-Pyrazol-1-Yl Moiety Based Os(IV) Compounds: Synthesis, Characterization and Biological Evaluation. J Fluoresc 2021; 31:349-362. [PMID: 33389418 DOI: 10.1007/s10895-020-02657-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 12/03/2020] [Indexed: 10/22/2022]
Abstract
Osmium(IV) pyrazole compounds and ligands were synthesized and well characterised. Ligands were characterized by heteronuclear NMR spectroscopy (1H & 13C), elemental analysis, IR spectroscopy and liquid crystal mass spectroscopy. Os(IV) complexes were characterized by ESI-MS, ICP-OES, IR spectroscopy, conductance measurements, magnetic measurements and electronic spectroscopy. Binding of compounds with HS-DNA were evaluated using viscosity measurements, absorption titration, fluorescence quenching, and molecular docking, which show effective intercalation mode exhibited by compounds. Binding constant of Os(IV) complexes are found to be 8.1 to 9.2 × 104 M-1. Bacteriostatic and cytotoxic activities were carried out to evaluate MIC, LC50, and IC50. The compounds have been undergone bacteriostatic screening using three sets of Gram+ve and two sets of Gram-ve bacteria. MIC of complexes are found to be 72.5-100 μM, whereas that of ligands fall at about 122.5-150 μM.. LC50 count of ligands fall in the range of 16.22-17.28 μg/mL whereas that of complexes of Os(IV) fall in the range of 4.87-5.87 μg/mL. IC50 of osmium compounds were evaluated using HCT-116 cell line. All the Os(IV) compounds show moderate IC50.
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Affiliation(s)
- Bharat H Pursuwani
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Gujarat, 388 120, India
| | - Bhupesh S Bhatt
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Gujarat, 388 120, India
| | - Foram U Vaidya
- Cell Biology Laboratory, Indian Institute of Advanced Research, Koba, Gandhinagar, Gujarat, 382421, India
| | - Chandramani Pathak
- Cell Biology Laboratory, Indian Institute of Advanced Research, Koba, Gandhinagar, Gujarat, 382421, India
| | - Mohan N Patel
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Gujarat, 388 120, India.
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Luo LJ, Su QQ, Cheng SC, Xiang J, Man WL, Shu WM, Zeng MH, Yiu SM, Ko CC, Lau TC. Tunable Luminescent Properties of Tricyanoosmium Nitrido Complexes Bearing a Chelating O^N Ligand. Inorg Chem 2020; 59:4406-4413. [PMID: 32154724 DOI: 10.1021/acs.inorgchem.9b03554] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have recently reported a strongly luminescent osmium(VI) nitrido complex [OsVI(N)(NO2-L)(CN)3]- [HNO2-L = 2-(2-hydroxy-5-nitrophenyl)benzoxazole]. The excited state of this complex readily activates the strong C-H bonds of alkanes and arenes (Commun. Chem. 2019, 2, 40). In this work, we attempted to tune the excited-state properties of this complex by introducing various substituents on the bidentate L ligand. The series of nitrido complexes were characterized by IR, UV/vis, 1H NMR, and electrospray ionization mass spectrometry. The molecular structures of five of the nitrido compounds have been determined by X-ray crystallography. The photophysical and electrochemical properties of these complexes have been investigated. The luminescence of these nitrido complexes in the solid state, in a CH2Cl2 solution, and in a CH2Cl2 solid matrix at 77 K glassy medium clearly shows that these emissions are due to 3LML'CT [L ligand to Os≡N] phosphorescence. The presence of strongly electron-withdrawing substituents in these complexes enhances the LML'CT emission. Our result demonstrates that the excited-state properties of this novel class of luminescent osmium(VI) nitrido complexes can be fine-tuned by introducing various substituents on the bidentate L ligand.
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Affiliation(s)
- Li-Juan Luo
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China
| | - Qian-Qian Su
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China
| | - Shun-Cheung Cheng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong
| | - Jing Xiang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China
| | - Wai-Lun Man
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Wen-Ming Shu
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China
| | - Ming-Hua Zeng
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry & Chemical Engineering, Hubei University, Wuhan 430062, China
| | - Shek-Man Yiu
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong
| | - Chi-Chiu Ko
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong
| | - Tai-Chu Lau
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong
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Su QQ, Fan K, Huang XD, Xiang J, Cheng SC, Ko CC, Zheng LM, Kurmoo M, Lau TC. Field-induced slow magnetic relaxation in low-spin S = 1/2 mononuclear osmium(v) complexes. Dalton Trans 2020; 49:4084-4092. [PMID: 32134093 DOI: 10.1039/d0dt00295j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Photochemical reactions of (PPh4)[OsVI(N)(L)(CN)3] (NO2-OsN) with piperidine and pyrrolidine afforded two osmium(v) hydrazido compounds, (PPh4)[OsV(L)(CN)3(NNC5H10)] ([PPh4]1) and (PPh4)[OsV(L)(CN)3(NNC4H8)] ([PPh4]2), respectively. Their structures consist of isolated, mononuclear distorted octahedral osmium anions that are well-separated from each other by PPh4+. Their low spin S = 1/2 and L = 1 ground state was confirmed by magnetometry and DFT calculations. Interestingly, both compounds exhibit slow magnetic relaxation under a bias dc-field. These osmium(v) complexes are potentially useful building-blocks for the construction of molecule-based architectures with interesting magnetic properties. In contrast, the structurally related (PPh4)[OsIII(L)(CN)3(NH3)] ([PPh4]3), which also has a low-spin S = 1/2 ground state but with a different electronic configuration (5d5), does not exhibit slow magnetic relaxation, due to the absence of any orbital moment (L = 0). Furthermore, the structurally different osmium(v) hydrazido compound reported by Meyer, [OsV(tpy)(Cl)2(NNC5H10)](PF6) (4[PF6]), also does not exhibit slow magnetic relaxation due possibly to a change in magnetic anisotropy from axial for [PPh4]1 and [PPh4]2 to planar.
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Affiliation(s)
- Qian-Qian Su
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China.
| | - Kun Fan
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Xin-Da Huang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Jing Xiang
- College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China.
| | - Shun-Cheung Cheng
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong.
| | - Chi-Chiu Ko
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong.
| | - Li-Min Zheng
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
| | - Mohamedally Kurmoo
- Institut de Chimie, Université de Strasbourg, CNRS-UMR7177, 4 rue Blaise Pascal, Strasbourg Cedex 67007, France
| | - Tai-Chu Lau
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong.
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