2D-Coordination polymers based on 1H-indazole-4-carboxylic acid and transition metal ions: magnetic, luminescence and biological properties

Antonio A García-Valdivia,Andoni Zabala-Lekuona,Belén Fernández,Javier Cepeda,Antonio Rodríguez-Diéguez,Gloria B Ramírez-Rodríguez,José M Delgado-López

doi:10.1039/d0ce00544d

Abstract

Five novel multifunctional coordination polymers (CPs) based on 1H-indazole-4-carboxylic acid are reported. These complexes, the first examples of CPs with this novel ligand, show interesting magnetic, luminescence and biological properties.

Highlights

The study of the properties of these materials can be very interesting, it can enable promising photoluminescence performance resulting from aromatic rings, and it has been seen in some recent studies that they can have very interesting anti-cancer properties, turning these CPs into interesting multifunctional materials.5086 | CrystEngComm, 2020, 22, 5086–5095 PaperScheme 1 Plausible coordination modes of 1H-indazole-4-carboxylic acid.Considering all of the above, in this work, we present a new family of 2D-coordination polymers, [CoIJL)2IJH2O)2]n (1), [NiIJL)2IJH2O)2]n (2), [CuIJL)2IJH2O)]n (3), [ZnIJL)2]n (4) and [CdIJL)2]n (5), based on 1H-indazole-4-carboxylic acid and transition metal ions, which have been fully characterized from a structural, luminescence and cytotoxic point of view, highlighting the magnetic properties
A solvothermal reaction between 1H-indazole-4-carboxylic acid and the corresponding metal salts in DMF : H2O (1 : 1) for 24 h produces five new metal–organic frameworks (MOFs) coordination polymers based on two-dimensional systems with interesting properties
CPs 4 and 5 exhibit hypsochromic emission with respect to the free ligand, arising from either structural and/ or electronic features resulting from events other than metal coordination

Summary

Introduction

The study of the properties of these materials can be very interesting, it can enable promising photoluminescence performance resulting from aromatic rings, and it has been seen in some recent studies that they can have very interesting anti-cancer properties, turning these CPs into interesting multifunctional materials.5086 | CrystEngComm, 2020, 22, 5086–5095 PaperScheme 1 Plausible coordination modes of 1H-indazole-4-carboxylic acid.Considering all of the above, in this work, we present a new family of 2D-coordination polymers, [CoIJL)2IJH2O)2]n (1), [NiIJL)2IJH2O)2]n (2), [CuIJL)2IJH2O)]n (3), [ZnIJL)2]n (4) and [CdIJL)2]n (5), based on 1H-indazole-4-carboxylic acid and transition metal ions, which have been fully characterized from a structural, luminescence and cytotoxic point of view, highlighting the magnetic properties. In addition to the hydrogen bonds, intermolecular π⋯π interactions among indazole rings significantly influence the crystal packing of the structure and the stabilization of the independent 2D layers (Fig. 2b and S2†).

Results

Conclusion