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Jeong AR, Park SR, Shin JW, Kim J, Tokunaga R, Hayami S, Min KS. Mononuclear Fe(III) complexes with 2,4-dichloro-6-((quinoline-8-ylimino)methyl)phenolate: synthesis, structure, and magnetic behavior. Dalton Trans 2024; 53:6809-6817. [PMID: 38545959 DOI: 10.1039/d3dt04385a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Three Fe(III)-based coordination complexes [Fe(dqmp)2](NO3)·H2O (1), [Fe(dqmp)2](BF4)·2CH3COCH3 (2), and [Fe(dqmp)2](ClO4) (3) were synthesized from Fe(NO3)3·9H2O/Fe(ClO4)3·xH2O, NaBF4, and 2,4-dichloro-6-((quinoline-8-ylimino)methyl)phenol (Hdqmp) in methanol/acetone and characterized. The structures of complexes 1-3 were determined via single-crystal X-ray crystallography at 100 K and room temperature, and their magnetic properties in the solid and solution forms were investigated. All complexes showed meridional structures with two tridentate dqmp- ligands coordinated with Fe(III) cations. In the solid state, complex 1 showed an abrupt and complete spin crossover at 225 K, whereas complexes 2 and 3 exhibited an incomplete spin crossover at 135 and 150 K, respectively. In a dimethylformamide solution, the complexes showed counterion-dependent spin transitions. In contrast to the solid state, in solution, complex 1 did not exhibit complete spin crossover. However, complexes 2 and 3 showed more complete spin transitions in solutions than in the solid state. The relaxation times, T1 and T2, for 1 and 2 were determined and both increased with temperature from 220 to 380 K. The T1 of 1 was larger than that of 2 at 380 K, and the T1 values were larger than the T2 values.
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Affiliation(s)
- Ah Rim Jeong
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea.
| | - Si Ra Park
- Department of Chemistry Education, Kyungpook National University, Daegu 41566, Republic of Korea.
| | - Jong Won Shin
- Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea.
| | - Jihyun Kim
- Department of Chemistry Education, Kyungpook National University, Daegu 41566, Republic of Korea.
| | - Ryuya Tokunaga
- Department of Chemistry, Kumamoto University, Kumamoto 860-8555, Japan
| | - Shinya Hayami
- Department of Chemistry, Kumamoto University, Kumamoto 860-8555, Japan
| | - Kil Sik Min
- Department of Chemistry Education, Kyungpook National University, Daegu 41566, Republic of Korea.
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Polyzou CD, Gkolfi P, Chasapis CT, Bekiari V, Zianna A, Psomas G, Ondrej M, Tangoulis V. Stimuli-responsive spin crossover nanoparticles for drug delivery and DNA-binding studies. Dalton Trans 2022; 51:12427-12431. [PMID: 35920617 DOI: 10.1039/d2dt01509a] [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
Aminated silica hybrid, spin-crossover (SCO) nanoparticles (AmNPs) coupled with (S)-naproxen (NAP) were proposed for potential drug nanocarriers through drug release experiments at various pH values. DNA- and albumin-binding studies were also carried out using diverse techniques in order to investigate the interaction of the nanoparticles with calf-thymus DNA and serum albumins and to determine the corresponding binding constants.
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Affiliation(s)
- Christina D Polyzou
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
| | - Patroula Gkolfi
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
| | - Christos T Chasapis
- NMR Facility, Instrumental Analysis Laboratory, School of Natural Sciences, University of Patras, 26504 Patras, Greece
| | - Vlasoula Bekiari
- Department of Crop Science, University of Patras, 30200 Messolonghi, Greece
| | - Ariadni Zianna
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
| | - George Psomas
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
| | - Malina Ondrej
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic
| | - Vassilis Tangoulis
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504 Patras, Greece.
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Gkolfi P, Tsivaka D, Tsougos I, Vassiou K, Malina O, Polaskova M, Polyzou CD, Chasapis CT, Tangoulis V. A facile approach to prepare silica hybrid, spin-crossover water-soluble nanoparticles as potential candidates for thermally responsive MRI agents. Dalton Trans 2021; 50:13227-13231. [PMID: 34546269 DOI: 10.1039/d1dt02479e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A reverse micelle method was used for the synthesis of water-soluble silica hybrid, spin-crossover (SCO) nanoparticles (NPs). MRI experiments provided temperature dependent T2 values, indicating their potential use as smart MRI agents, while lyophilization of NP dispersions in water yielded powders with a preserved but modified thermal hysteretic magnetic profile.
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Affiliation(s)
- Patroula Gkolfi
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
| | - Dimitra Tsivaka
- Department of Medical Physics, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece.
| | - Ioannis Tsougos
- Department of Medical Physics, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece.
| | - Katerina Vassiou
- Department of Radiology, University Hospital of Larissa, University of Thessaly, Biopolis, GR-41110 Larissa, Greece
| | - Ondřej Malina
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic.
| | - Michaela Polaskova
- Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute (CATRIN), Palacký University Olomouc, Czech Republic. .,Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Christina D Polyzou
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
| | - Christos T Chasapis
- NMR Facility, Instrumental Analysis Laboratory, School of Natural Sciences, University of Patras, 26504, Patras, Greece
| | - Vassilis Tangoulis
- Department of Chemistry, Laboratory of Inorganic Chemistry, University of Patras, 26504, Patras, Greece.
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