Benzoate substituents effects on the structure of Zn(II) complexes and 1D 4,4′-bipyridine derived coordination polymers

• Published in: Inorganica Chimica Acta 2020-01, Vol.500, p.119218, Article 119218
• Main Authors: Sánchez-Férez, Francisco, Pou, Roger, Bayés-García, Laura, Font-Bardia, Mercè, Pons, Josefina, Ayllón, José A.
• Format: Article
• Language: English
• Subjects: Arrays; Benzoates; Chemical composition; Chemical synthesis; Coordination polymer; Coordination polymers; Crystal structure; Ligands; Methanol; N-Heterocyclic ligands; Organic chemistry; Photoluminescence properties; Polymers; Recrystallization; Solvents; Supramolecular network; Zinc compounds; Zn(II) complexes
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/j.ica.2019.119218

[Display omitted] •Reactions between Zn(MeCO2)2, 3,5-dihydroxybenzoic or 3,5-dimethoxybenzoic acids and 4,4′-bipyiridine have been performed.•The use of different solvents has a great influence on the formation of the final products.•The crystal structure of a paddle-wheel and three polymeric compounds has been elucidated.•The 4,4′-bipyiridine ligand promoted the formation of zig-zag polymeric chains.•The CPs including 3,5-(MeO)2Bz and 4,4′-bpy demonstrated blue-green emission in the solid state. The aim of this work is to study the influence of different substituents in two closely related ligands, 3,5-dihydroxybenzoate (3,5-(HO)2Bz) and 3,5-dimethoxybenzoate (3,5-(MeO)2Bz), in the structure of zinc complexes. The compound [Zn(3,5-(MeO)2Bz)2(CH3OH)]2 (2) has been synthesized, characterized and its crystal structure elucidated, showing a paddle wheel type dinuclear molecule, with four bridging carboxylate ligands in a syn-syn coordination mode and methanol molecules in the apical positions. This discrete structural array is different than the polymeric structure observed in {[Zn(µ-3,5-(HO)2Bz)(µ-OH2)(H2O)2]·3,5-(HO)2Bz·4H2O}n, previously reported in our group. These two zinc complexes were used as precursor for the synthesis of coordination polymers (CPs) with the 4,4′-bipyridine (4,4′-bpy) linker. The solvent used in their synthesis influences the chemical composition of this CPs. Thus, {[Zn(3,5-(HO)2Bz)2(µ-4,4′-bpy)]·2DMSO}n (3) was achieved in dimethylsulfoxide (DMSO) while {[Zn(3,5-(HO)2Bz)2(µ-4,4′-bpy)]·4,4′-bpy·1/2CH3OH}n (4) was formed in methanol (MeOH) as solvent. The reaction of 2 with 4,4′-bpy yielded [Zn2(μ-3,5-(MeO)2Bz)4(µ-4,4′-bpy)]n (5) in methanol, while after recrystallization in boiling water, complex {[Zn(3,5-(MeO)2Bz)2(µ-4,4′-bpy)]·H2O}n (6) was isolated in low yield. This compound 6 can also be synthesized by a mechanochemical approach, using water in a liquid assisted grinding. The crystal structures of complexes 3, 4 and 6 were elucidated, all three showing zigzag polymeric arrays. Both polymers containing 3,5-(MeO)2Bz (5 and 6), showed solid state luminescence.