This work presents the fabrication of 3D printed composite objects based on copper(II) one-dimensional coordination polymer (CP1) decorated with thymine along its chains with potential utility as an environmental humidity sensor and as a water sensor in organic solvents. This new composite object has a remarkable sensitivity, ranging from 0.3 to 4% of water in organic solvents. The sensing capacity is related to the structural transformation due to the loss of water molecules that CP1 undergoes with temperature or by solvent molecules competition, which induces significant change in color simultaneously. The CP1 and 3D printed materials are stable in air over one year and also at biological pHs (5-7), therefore suggesting potential applications as robust colorimetric sensor. These results open the door to generate a family of new 3D printed materials based on the integration of multifunctional coordination polymers with organic polymers.
The direct reaction between copper nitrate, thymine-1-acetic acid, and 4,4'-bipyridine in water leads to the formation of a blue colloid comprising uniform crystalline nanoribbons (length >1 μm; width ca. 150-185 nm; diameter ca. 15-60 nm) of a coordination polymer. The polymer displays a thymine-based structure freely available for supramolecular interactions. These nanostructures show significant selective interaction with single-stranded oligonucleotides based on adenine. Remarkably, they present low cell toxicity in three cell lines-despite the copper(II) content-and can be used as nanocarriers of oligonucleotides. These results suggest the potential of these types of nanostructures in several biological applications.
Abstract:We report on the use of different reaction conditions, e.g., temperature, time, and/or concentration of reactants, to gain control over the particle formation of a bioinspired coordination polymer based on copper(II) and adenine, allowing homogeneous particle production from microto submicro-, and up to nano-size. Additionally, studies on this reaction carried out in the presence of different surfactants gives rise to the control of the particle size due to the modulation of the electrostatic interactions. Stability of the water suspensions obtained within the time and pH has been evaluated. We have also studied that there is no significant effect of the size reduction in the magnetic properties of the Cu(II)-adenine coordination polymer.
The direct reaction between Cu(CH3COO)2 and uracil-1-acetic acid in water gives rise to the formation of a hydrogel consisting of entangled nanometric ribbons of a 1D Cu(ii) coordination polymer (CP) decorated with biocompatible uracil nucleobases.
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