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2020-03-17

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cc-by (c) Pantelis, Konstantinos N et al., 2020
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: 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

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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.

Matèries

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

Matèries (anglès)

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

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Articles publicats en revistes (Química Inorgànica i Orgànica)

Citació

PANTELIS, Konstantinos n., KAROTSIS, Georgios, LAMPROPOULOS, Christos, CUNHA-SILVA, Luís, ESCUER FITÉ, Albert, STAMATATOS, Theocharis c.. 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), núm. 1352. [consulta: 21 de gener de 2026]. ISSN: 1996-1944. [Disponible a: https://hdl.handle.net/2445/173732]

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