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Oña OB, Alcoba DR, Massaccesi GE, Torre A, Lain L, Melo JI, Oliva-Enrich JM, Peralta JE. Magnetic Properties of Co(II) Complexes with Polyhedral Carborane Ligands. Inorg Chem 2019; 58:2550-2557. [PMID: 30694654 DOI: 10.1021/acs.inorgchem.8b03156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work we present a computational analysis of a new family of magnetic Co(II) single-ion complexes with large magnetic anisotropy based on icosahedral and octahedral carborane ligands. In particular, we extend our previous computational work on mononuclear Co(II) complexes with 1,2-(HS)2-1,2-C2B10H10 and 9,12-(HS)2-1,2-C2B10H10 icosahedral o-carborane ligands to a larger set of complexes where the Co(II) ion is doubly chelated by those ligands and by other two positional isomers belonging to the 1,2-dicarba- closo-dodecaborane family. We also describe Co(II) complexes with octahedral ligands derived from 1,2-dicarba- closo-hexaborane and study the effects of replacing a thiol group by a hydroxy group in both polyhedral geometries, as well as the influence of the position of the carbon atoms. On analysis of the results for a total of 20 complexes, our results show that carborane-based Co(II) single-ion compounds present a distorted-tetrahedral geometry, high-spin ground states, and high values for the magnetic anisotropy parameters. We point out which of these would be suitable candidates to be synthesized and used as molecular magnets.
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Affiliation(s)
- Ofelia B Oña
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas , Universidad Nacional de la Plata, CCT La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas , Diag. 113 y 64 (s/n) , Sucursal 4, CC 16, 1900 La Plata , Argentina
| | - Diego R Alcoba
- Departamento de Física, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria, 1428 Buenos Aires , Argentina.,Instituto de Física de Buenos Aires , Consejo Nacional de Investigaciones Científicas y Técnicas , Ciudad Universitaria, 1428 Buenos Aires , Argentina
| | - Gustavo E Massaccesi
- Departamento de Ciencias Exactas, Ciclo Básico Común , Universidad de Buenos Aires , Ciudad Universitaria, 1428 Buenos Aires , Argentina
| | - Alicia Torre
- Departamento de Química Física, Facultad de Ciencia y Tecnología , Universidad del País Vasco , Apdo. 644, E-48080 Bilbao , Spain
| | - Luis Lain
- Departamento de Química Física, Facultad de Ciencia y Tecnología , Universidad del País Vasco , Apdo. 644, E-48080 Bilbao , Spain
| | - Juan I Melo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria, 1428 Buenos Aires , Argentina.,Instituto de Física de Buenos Aires , Consejo Nacional de Investigaciones Científicas y Técnicas , Ciudad Universitaria, 1428 Buenos Aires , Argentina
| | - Josep M Oliva-Enrich
- Instituto de Química Física "Rocasolano" , Consejo Superior de Investigaciones Científicas , 28006 Madrid , Spain
| | - Juan E Peralta
- Department of Physics , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
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Alcoba DR, Oña OB, Massaccesi GE, Torre A, Lain L, Melo JI, Peralta JE, Oliva-Enrich JM. Magnetic Properties of Mononuclear Co(II) Complexes with Carborane Ligands. Inorg Chem 2018; 57:7763-7769. [PMID: 29894170 DOI: 10.1021/acs.inorgchem.8b00815] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We analyze the magnetic properties of three mononuclear Co(II) coordination complexes using quantum chemical complete active space self-consistent field and N-electron valence perturbation theory approaches. The complexes are characterized by a distorted tetrahedral geometry in which the central ion is doubly chelated by the icosahedral ligands derived from 1,2-(HS)2-1,2-C2B10H10 (complex I), from 1,2-(HS)2-1,2-C2B10H10 and 9,12-(HS)2-1,2-C2B10H10 (complex II), and from 9,12-(HS)2-1,2-C2B10H10 (complex III), which are two positional isomers of dithiolated 1,2-dicarba- closo-dodecaborane (complex I). Complex I was realized experimentally recently (Tu, D.; Shao, D.; Yan, H.; Lu, C. Chem. Commun. 2016, 52, 14326) and served to validate the computational protocol employed in this work, while the remaining two proposed complexes can be considered positional isomers of I. Our calculations show that these complexes present different axial and rhombic zero-field splitting anisotropy parameters and different values of the most significant components of the g tensor. The predicted axial anisotropy D = -147.2 cm-1 for complex II is twice that observed experimentally for complex I, D = -72.8 cm-1, suggesting that this complex may be of interest for practical applications. We also analyze the temperature dependence of the magnetic susceptibility and molar magnetization for these complexes when subject to an external magnetic field. Overall, our results suggest that o-carborane-incorporated Co(II) complexes are worthwhile candidates for experimental exploration as single-ion molecular magnets.
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Affiliation(s)
- Diego R Alcoba
- Departamento de Física, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria 1428 , Buenos Aires , Argentina.,Instituto de Física de Buenos Aires , Consejo Nacional de Investigaciones Científicas y Técnicas , Ciudad Universitaria 1428 , Buenos Aires , Argentina
| | - Ofelia B Oña
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas , Universidad Nacional de la Plata, CCT La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas , Diag. 113 y 64 (s/n), Sucursal 4, CC 16 1900 , La Plata , Argentina
| | - Gustavo E Massaccesi
- Departamento de Ciencias Exactas, Ciclo Básico Común , Universidad de Buenos Aires , Ciudad Universitaria 1428 , Buenos Aires , Argentina
| | - Alicia Torre
- Departamento de Química Física, Facultad de Ciencia y Tecnología , Universidad del País Vasco , Apartado 644 E-48080 , Bilbao , Spain
| | - Luis Lain
- Departamento de Química Física, Facultad de Ciencia y Tecnología , Universidad del País Vasco , Apartado 644 E-48080 , Bilbao , Spain
| | - Juan I Melo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria 1428 , Buenos Aires , Argentina.,Instituto de Física de Buenos Aires , Consejo Nacional de Investigaciones Científicas y Técnicas , Ciudad Universitaria 1428 , Buenos Aires , Argentina
| | - Juan E Peralta
- Department of Physics , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Josep M Oliva-Enrich
- Instituto de Química Física "Rocasolano", Consejo Superior de Investigaciones Científicas 28006 , Madrid , Spain
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