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2020-03-17

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cc-by (c) Pantelis, Konstantinos N et al., 2020
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/173732

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

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https://doi.org/10.3390/ma13061352

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.

Subject

Compostos de coordinació, Lligands, Complexos metàl·lics, Química supramolecular, Polímers inorgànics

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Coordination compounds, Ligands, Metal complexes, Supramolecular chemistry, Inorganic polymers

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Articles publicats en revistes (Química Inorgànica i Orgànica)

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PANTELIS, Konstantinos N., et al. 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. Materials. 2020. Vol. 13(6), num. 1352. ISSN 1996-1944. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/173732

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