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Exploration of catecholase-like activity of a series of magnetically coupled transition metal complexes of Mn, Co and Ni: new insights into the solution state behavior of Mn complexes.
Sarkar, Abani; Chakraborty, Aratrika; Adhikary, Amit; Maity, Suvendu; Mandal, Arnab; Samanta, Debabrata; Ghosh, Prasanta; Das, Debasis.
Afiliación
  • Sarkar A; Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India. dasdebasis2001@yahoo.com.
  • Chakraborty A; Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India. dasdebasis2001@yahoo.com.
  • Adhikary A; Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India. dasdebasis2001@yahoo.com.
  • Maity S; Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata 700 103, India.
  • Mandal A; Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India. dasdebasis2001@yahoo.com.
  • Samanta D; Department of Chemistry, Indian Institute of Technology, Kanpur, Kanpur-208016, India.
  • Ghosh P; Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata 700 103, India.
  • Das D; Department of Chemistry, University College of Science, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India. dasdebasis2001@yahoo.com.
Dalton Trans ; 48(37): 14164-14177, 2019 Oct 07.
Article en En | MEDLINE | ID: mdl-31506669
A series of tri-nuclear complexes of general formula [M3L2(OAc)4], where M = Mn (1), Co (2) and Ni (3), (HL = (E)-4-bromo-2-(((2-morpholinoethyl)imino)methyl)phenol), have been synthesized. Single crystal X-ray crystallography reveals that each molecule contains three metal ions which are bridged by four acetate moieties. In the solution phase, the complexes are present as mononuclear species. Amongst them, the manganese atom of complex 1 switches its oxidation state from +ii to +iii with time, as confirmed by time dependent UV-Vis and EPR spectroscopic techniques. Furthermore, complex 1 with Mn in both oxidation states can oxidise 3,5-DTBC to 3,5-DTBQ through the ligand centred radical formation pathway. It is remarkable that complex 1 in the MnII oxidation state shows an abnormally high rate constant value in the oxidation of 3,5-DTBC to 3,5-DTBQ. This difference in rate constant values for catechol oxidation reaction by complex 1 can be explained by considering the binding constant value of catechol with MnII and MnIII respectively from experimental and theoretical aspects. Similar to complex 1, complexes 2 and 3 also catalyse catechol oxidation following ligand centred imine radical formation pathways. Furthermore, magnetic properties of all the complexes were explored. DC magnetic susceptibility studies of complexes 1 and 2 revealed that in both the complexes the metal centres are antiferromagnetically coupled with adjacent metal centres, whereas in the case of complex 3, weak ferromagnetic interaction occurs between the neighbouring NiII centres at low temperature.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Dalton Trans Asunto de la revista: QUIMICA Año: 2019 Tipo del documento: Article País de afiliación: India Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Dalton Trans Asunto de la revista: QUIMICA Año: 2019 Tipo del documento: Article País de afiliación: India Pais de publicación: Reino Unido