Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor | Zendy

Subrata Ghosh | Zendy; Sujit Kamilya | Zendy; Mayurika Das | Zendy; Sakshi Mehta | Zendy; MarieEmmanuelle Boulon | Zendy; Ivan Němec | Zendy; Mathieu Rouzières | Zendy; Radovan Herchel | Zendy; Abhishake Mondal | Zendy

Open Access

Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor

Author(s) -

Subrata Ghosh,

Sujit Kamilya,

Mayurika Das,

Sakshi Mehta,

MarieEmmanuelle Boulon,

Ivan Němec,

Mathieu Rouzières,

Radovan Herchel,

Abhishake Mondal

Publication year - 2020

Publication title -

inorganic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.348

H-Index - 233

eISSN - 1520-510X

pISSN - 0020-1669

DOI - 10.1021/acs.inorgchem.0c00538

Subject(s) - chemistry , crystallography , coordination geometry , octahedral molecular geometry , square pyramidal molecular geometry , cobalt , octahedron , magnetic susceptibility , tetrahedral molecular geometry , magnetization , electron paramagnetic resonance , single crystal , crystal structure , ion , relaxation (psychology) , nuclear magnetic resonance , molecule , inorganic chemistry , magnetic field , hydrogen bond , physics , organic chemistry , quantum mechanics , social psychology , psychology

The three Co(II) complexes [Co(bbp) 2 ][Co(NCS) 4 ]·4DMF ( 1 ), [Co(bbp)(NCS) 2 (DMF)]·2DMF ( 2 ), and [Co(bbp)(NCS) 2 ] ( 3 ) have been synthesized and characterized by single-crystal X-ray diffraction, magnetic, and various spectroscopic techniques. Complexes 1 and 3 are obtained by the reaction of Co(NCS) 2 with 2,6-bis(1 H -benzo[ d ]imidazol-2-yl)pyridine (bbp), and complex 1 undergoes a structural transformation to form complex 2 . A single-crystal X-ray study revealed that complex 1 is comprised of two Co(II) centers, a cationic octahedral Co(II) unit and an anionic tetrahedral Co(II) unit, while the Co(II) ion is in a distorted-octahedral environment in 2 . Moreover, in complex 3 , the Co(II) ion is in a distorted-square-pyramidal geometry. The effect of coordination geometry on the magnetic properties was studied by both static and dynamic magnetic measurements. Direct current (dc) magnetic susceptibility measurements showed that all of the Co(II) ions are in high-spin state in these complexes. Alternating current (ac) magnetic susceptibility measurements indicated that complexes 2 and 3 display slow relaxation of magnetization in an external dc magnetic field, while complex 1 displayed no such property. EPR experiments and theoretical calculations were consistent with the above findings.

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