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Title: Metal complexes as ligands' for the synthesis of coordination polymers: a MnIII monomer as a building block for the preparation of an unprecedented 1-D {MnIIMnIII}n linear chain
Author: Pantelis, Konstantinos N.
Karotsis, Georgios
Lampropoulos, Christos
Cunha-Silva, Luís
Escuer Fité, Albert
Stamatatos, Theocharis C.
Keywords: Compostos de coordinació
Complexos metàl·lics
Química supramolecular
Polímers inorgànics
Coordination compounds
Metal complexes
Supramolecular chemistry
Inorganic polymers
Issue Date: 17-Mar-2020
Publisher: MDPI
Abstract: A relatively unexplored synthetic route in redox-active Mn(II/III) coordination chemistry has been employed toward the preparation of a new mixed-valence MnII/III 1-D linear chain from the reaction of [MnIII(sacb)2]􀀀 precursor with a MnII source, where sacbH2 is the Schiff base ligand N-salicylidene-2-amino-5-chlorobenzoic acid. The mononuclear (Pr2NH2)[MnIII(sacb)2] (1) compound was obtained in excellent yields (>85%) from the 1:2:3 reaction of Mn(O2CMe)2 4H2O, sacbH2 and Pr2NH, respectively. In 1, the two doubly deprotonated sacb2􀀀 ligands act as Ocarboxylate,Nimine,Ophenoxide-tridentate chelates, while the second carboxylate O atom of sacb2􀀀 is dangling and H-bonded to the Pr2NH2 + countercation. Complex 1 was subsequently used as a 'ligand' to react stoichiometrically with the 'metal' Mn(NO3)2 4H2O, thus leading to the 1-D coordination polymer {[MnIIMnIII(sacb)2(H2O)2(MeOH)2](NO3)}n (2) in good yields (~50%). The removal of Pr2NH2 + from the vicinity of the [MnIII(sacb)2]􀀀 metalloligand has rendered possible (vide infra) the coordination of the second Ocarboxylate of sacb2􀀀 to neighboring {MnII(H2O)2(MeOH)2}2+ units, and consequently the formation of the 1-D polymer 2. Direct-current (dc) magnetic susceptibility studies revealed the presence of very weak antiferromagnetic exchange interactions between alternating MnIII and MnII atoms with a coupling constant of J = 􀀀0.08 cm􀀀1 for g = 2.00. The combined results demonstrate the potential of the 'metal complexes as ligands' approach to yield new mixed-valence Mn(II/III) coordination polymers with interesting structural motifs and physicochemical properties.
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It is part of: Materials, 2020, vol. 13(6), num. 1352
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ISSN: 1996-1944
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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