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Metal transition complexes of tridentate Schiff base ligands derived from 2-hydrazinopyridine: synthesis, spectroscopic characterization and X-ray structures

Metal transition complexes of tridentate Schiff base ligands derived from 2-hydrazinopyridine: synthesis, spectroscopic characterization and X-ray structures
Metal transition complexes of tridentate Schiff base ligands derived from 2-hydrazinopyridine: synthesis, spectroscopic characterization and X-ray structures
Mononuclear complexes of 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)hydrazine (HL1) and 1-(pyridin-2-yl)-2-(1-(pyridin-2-yl)ethylidene)hydrazine (HL2), [Mn(HL1)(Cl2)(H2O)] (1), [Zn(HL1)(CH3COO)2]·(H2O)3 (2)[Mn(HL2)2]·(ClO4)2 (3) and[Cu(HL2)(NO3)2(H2O)] (4) were synthesized and characterized by physicochemical and spectroscopic methods and X-ray structure determination. The mononuclear compounds 1, 2 and 4 contain one ligand molecule per metal atom while themanganese (II) atom in compound 3 is coordinated to two ligand molecules. Both ligands coordinated to the transition metalcenter in a tridentate fashion through two Npyridylatoms and one Nimino
atom. The chloride and acetate anions coordinate inmonodentate manner, respectively, in complex 1 and in complex 2. In complex 3, the perchlorate groups remain uncoordinated.In complex 4, the nitrate anions act in unidentate fashion. The molar conductance value indicates that the complexes obtained from HL1are non-electrolytes while those obtained from HL2 are 2:1 electrolytes in DMF solutions. The X-ray structures reveal octahedral geometry for complexes 1, 3, 4 and trigonal bipyramidal environment for 2.
0340-4285
Diop, Amar
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Sarr, Mamou
f3d50636-e69f-49a7-a1db-da0456794333
Diop, Mayoro
705dbfce-a32a-4eb9-a868-8f0d57c29cc4
Thiam, Ibrahima Elhadj
e6458223-d3a8-4d23-a9fa-dacf54a959a6
Barry, Aliou Hamady
01997e72-6383-460c-8af9-a447c565bd60
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Orton, James
4e2a471f-9e11-4cb4-abb6-d0398047939f
Gaye, Mohamed
49339bab-a87c-4916-a936-33cb1147e9d0
Diop, Amar
576e1c8a-6968-4cd8-9d1c-3a1e5560b304
Sarr, Mamou
f3d50636-e69f-49a7-a1db-da0456794333
Diop, Mayoro
705dbfce-a32a-4eb9-a868-8f0d57c29cc4
Thiam, Ibrahima Elhadj
e6458223-d3a8-4d23-a9fa-dacf54a959a6
Barry, Aliou Hamady
01997e72-6383-460c-8af9-a447c565bd60
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Orton, James
4e2a471f-9e11-4cb4-abb6-d0398047939f
Gaye, Mohamed
49339bab-a87c-4916-a936-33cb1147e9d0

Diop, Amar, Sarr, Mamou, Diop, Mayoro, Thiam, Ibrahima Elhadj, Barry, Aliou Hamady, Coles, Simon J., Orton, James and Gaye, Mohamed (2019) Metal transition complexes of tridentate Schiff base ligands derived from 2-hydrazinopyridine: synthesis, spectroscopic characterization and X-ray structures. Transition Metal Chemistry. (doi:10.1007/s11243-019-00317-3).

Record type: Article

Abstract

Mononuclear complexes of 1-(pyridin-2-ylmethylidene)-2-(pyridin-2-yl)hydrazine (HL1) and 1-(pyridin-2-yl)-2-(1-(pyridin-2-yl)ethylidene)hydrazine (HL2), [Mn(HL1)(Cl2)(H2O)] (1), [Zn(HL1)(CH3COO)2]·(H2O)3 (2)[Mn(HL2)2]·(ClO4)2 (3) and[Cu(HL2)(NO3)2(H2O)] (4) were synthesized and characterized by physicochemical and spectroscopic methods and X-ray structure determination. The mononuclear compounds 1, 2 and 4 contain one ligand molecule per metal atom while themanganese (II) atom in compound 3 is coordinated to two ligand molecules. Both ligands coordinated to the transition metalcenter in a tridentate fashion through two Npyridylatoms and one Nimino
atom. The chloride and acetate anions coordinate inmonodentate manner, respectively, in complex 1 and in complex 2. In complex 3, the perchlorate groups remain uncoordinated.In complex 4, the nitrate anions act in unidentate fashion. The molar conductance value indicates that the complexes obtained from HL1are non-electrolytes while those obtained from HL2 are 2:1 electrolytes in DMF solutions. The X-ray structures reveal octahedral geometry for complexes 1, 3, 4 and trigonal bipyramidal environment for 2.

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Accepted/In Press date: 15 March 2019
e-pub ahead of print date: 26 April 2019

Identifiers

Local EPrints ID: 431057
URI: https://eprints.soton.ac.uk/id/eprint/431057
ISSN: 0340-4285
PURE UUID: 7e8f35f0-ae70-458f-8409-3287ee7420cd
ORCID for Simon J. Coles: ORCID iD orcid.org/0000-0001-8414-9272

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Date deposited: 22 May 2019 16:30
Last modified: 20 Jul 2019 01:10

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Contributors

Author: Amar Diop
Author: Mamou Sarr
Author: Mayoro Diop
Author: Ibrahima Elhadj Thiam
Author: Aliou Hamady Barry
Author: Simon J. Coles ORCID iD
Author: James Orton
Author: Mohamed Gaye

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