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Hamaguchi T, Ishikawa R, Mishima A, Hayami S, Ohba M, Satoh M, Kawata S. The structure and modified properties of a self-dimerised Cu(II) inclusion complex in γ-cyclodextrins. Dalton Trans 2023; 52:4475-4480. [PMID: 36919758 DOI: 10.1039/d3dt00176h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Inclusion structures incorporating more than one guest molecule are elusive because confinement alters their molecular properties. We report the solid-state characterization of an inclusion complex comprising two γ-cyclodextrins and two [Cu(2-pyridinemethanolate)(2-pyridinemethanol)]PF6 units. Quantum calculation reveals that interfragment charge transfer occurs. The confined Cu fragment and the unincluded "linear chain [Cu(2-pyridinemethanolate)(2-pyridinemethanol)]PF6" exhibit different properties.
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Affiliation(s)
- Tomohiko Hamaguchi
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
| | - Ryuta Ishikawa
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
| | - Akio Mishima
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744 Motooka, Nishi-ku, 819-0395, Fukuoka, Japan
| | - Shinya Hayami
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.,Institute of Pulsed Power Science, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Masaaki Ohba
- Department of Chemistry, Faculty of Sciences, Kyushu University, 744 Motooka, Nishi-ku, 819-0395, Fukuoka, Japan
| | - Minoru Satoh
- Department of Industrial Engineering, National Institute of Technology (KOSEN), Ibaraki College, 866 Nakane, Hitachinaka-shi, Ibaraki-ken 312-8508, Japan
| | - Satoshi Kawata
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
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Pérez H, Di Santo A, Piro OE, Echeverría GA, González M, Ben Altabef A, Gomila RM, Frontera A, Gil DM. Novel 'main-part' isostructuralism in metal complexes with 1-methylimidazole: crystal structures, energy calculations and magnetic properties. Dalton Trans 2021; 50:17029-17040. [PMID: 34761774 DOI: 10.1039/d1dt03159g] [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
Two new transition metal complexes with 1-methylimidazole (1-MeIm) and azide as ligands, namely, [Co(1-MeIm)4(N3)2] (1) and [Ni(1-MeIm)4(N3)2] (2), have been synthesized and characterized by IR, Raman, UV-Vis and XPS spectroscopy. Their crystal structures were solved by single-crystal X-ray diffraction. The supramolecular self-assembly of the two complexes is governed by non-classical C-H⋯N hydrogen bonds and C-H⋯π interactions. Lattice energies and intermolecular interaction energies for various molecular pairs are quantified using the PIXEL method. DFT computational studies to assess the binding energy through modern tools like non-covalent interaction (NCI plots) analysis and reduced density gradient (RDG) analysis have also been carried out. A detailed analysis of geometric descriptors revealed the existence of quasi-isostructural pairs or 'main-part' isostructuralism in a series formed by 1, 2, and a related cadmium complex, being more evident in the 1/2 pair. DFT studies using theoretical models have been used to disclose the relative importance of the H-bond and C-H⋯π noncovalent interactions. Magnetic measurements for compound 1 show weak ferrimagnetic coupling between adjacent M(II) centers, mediated by H-bonding and C-H⋯π non-covalent interactions.
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Affiliation(s)
- Hiram Pérez
- Departamento de Química General e Inorgánica, Facultad de Química, Universidad de La Habana, CP 10400, La Habana, Cuba.
| | - Alejandro Di Santo
- INQUINOA (CONICET - UNT), Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, San Lorenzo 456, T4000CAN, San Miguel de Tucumán, Argentina
| | - Oscar E Piro
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata and IFLP institute (CONICET, CCT-La Plata), C.C. 67, 1900, La Plata, Argentina.
| | - Gustavo A Echeverría
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata and IFLP institute (CONICET, CCT-La Plata), C.C. 67, 1900, La Plata, Argentina.
| | - Marlene González
- CONACyT-Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, U. Legaria, Ciudad de México, Mexico
| | - Aida Ben Altabef
- INQUINOA (CONICET - UNT), Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, San Lorenzo 456, T4000CAN, San Miguel de Tucumán, Argentina
| | - Rosa M Gomila
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
| | - Diego M Gil
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata and IFLP institute (CONICET, CCT-La Plata), C.C. 67, 1900, La Plata, Argentina. .,INBIOFAL (CONICET - UNT), Instituto de Química Orgánica, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI, San Miguel de Tucumán, Argentina
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Basak T, Gómez-García CJ, Gomila RM, Frontera A, Chattopadhyay S. Hydrogen bond mediated intermolecular magnetic coupling in mononuclear high spin iron(iii) Schiff base complexes: synthesis, structure and magnetic study with theoretical insight. RSC Adv 2021; 11:3315-3323. [PMID: 35424292 PMCID: PMC8694023 DOI: 10.1039/d0ra09425k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 12/24/2020] [Indexed: 11/24/2022] Open
Abstract
The crystal structure and magnetic properties of two mononuclear iron(iii) Schiff base complexes, [FeL1(NCS)2] (1), HL1 = 2-[1-[[2-[(2-aminoethyl)amino]ethyl]imino]ethyl]phenol and [FeL2(N3)Cl] (2), HL2 = 2-(-1-(2-(2-aminoethylamino)ethylimino)ethyl)-4-methylphenol are reported. Each complex contains a Fe(iii) ion surrounded by a N3O Schiff base ligand and two NCS− ligands (in 1) or one N3− and one Cl− ligands (in 2). The magnetic properties can be well reproduced with zero field splittings in the high spin S = 5/2 Fe(iii) ions and weak intermolecular Fe–Fe interactions mediated by hydrogen bonds. This intermolecular antiferromagnetic interaction has been validated by using DFT calculations in complex 2. Moreover, the interaction energies of the H-bonded dimers in both complexes have been estimated using DFT calculations and characterized using a combination of QTAIM and NCI plot computational tools. Complexes 1 and 2 constitute two rare examples of Fe(iii) complexes with magnetic interactions through H-bonds. H-Bond mediated magnetic interactions in mononuclear iron(iii) Schiff base complexes were studied experimentally and validated by using DFT calculations. ![]()
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Affiliation(s)
- Tanmoy Basak
- Department of Chemistry, Inorganic Section, Jadavpur University Kolkata-700032 India
| | - Carlos J Gómez-García
- Departamento de Química Inorgánica, Instituto de Ciencia Molecular, Universidad de Valencia 46980 Paterna Valencia Spain
| | - Rosa M Gomila
- Serveis Científico-Tècnics, Universitat de les Illes Balears Crta de Valldemossa km 7.5 07122 Plama de Mallorca Baleares Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears Crta de Valldemossa km 7.5 07122 Palma de Mallorca Baleares Spain
| | - Shouvik Chattopadhyay
- Department of Chemistry, Inorganic Section, Jadavpur University Kolkata-700032 India
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Kobylarczyk J, Liberka M, Konieczny P, Baran S, Kubicki M, Korzeniak T, Podgajny R. Bulky ligands shape the separation between the large spin carriers to condition field-induced slow magnetic relaxation. Dalton Trans 2020; 49:300-311. [PMID: 31774091 DOI: 10.1039/c9dt03903a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crystal engineering of magnetic relaxation in supramolecular networks based on almost isotropic cyanido-bridged {Mn9[W(CN)8]6L8(solv)8} clusters decorated by bulky 4,4'-di-tert-butyl-2,2'-bipyridine (But2bpy) and 4,7-diphenyl-1,10-phenanthroline (Ph2phen) ligands is presented. The three new compounds {MnII9[WV(CN)8]6(But2bpy)8(MeOH)8}·Pri2O·13MeOH (1), {MnII9[WV(CN)8]6(But2bpy)8(MeOH)6(H2O)2}·4Pri2O·2H2O (1a), and {MnII9[WV(CN)8]6(Ph2phen)8(MeOH)8}·29MeOH·6H2O (2) were characterized structurally and magnetically. Compound 1 exhibits unequivocal domination of repulsive intercluster contacts operating between the side But groups leading to intercluster distances exceeding 10 Å in all three dimensions. Compound 1a reveals a 1-dimensional (1D) supramolecular chain structure with very close intercluster distances of 6.7 Å realized through the direct W-CNHO-Mn hydrogen bonds along the chain, further isolated by the above repulsive ButBut synthons. Compound 2 shows significant separation in all three directions with the intercluster distances close to 10, 12 and 13.5 Å. However, in contrast to 1, these separations are accompanied by indirect hydrogen bond arrays and local π-π interactions of potential to assist in the transfer of weak magnetic interactions. The dc magnetic data show the signature of S = 39/2 in the ground state, which is typical in this group of compounds. The high-spin clusters are accompanied by different intercluster interactions, illustrated by the effective zJ' values of +0.010 cm-1 (1), +0.008 cm-1 (1a) and +0.001 cm-1 (2). The low temperature ac susceptibility measurements revealed a temperature- and field-dependent magnetic relaxation time for all 1, 1a and 2 compounds (τ1, τ1a-fast, and τ2-fast in the range 10-3-10-4 s). In contrast and only in the case of 1a and 2, an additional temperature independent slow process was detected (τ1a-slow and τ2-slow located between 0.1 s and 1 s). The magnetic relaxations were correlated with the obtained supramolecular networks, indicating the significant role of dipolar fields, weak non-covalent interactions, hydrogen bonds and π-π interactions.
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Affiliation(s)
- Jedrzej Kobylarczyk
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland.
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