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Paramagnetic and Luminescent Properties of Gd Ascorbate Coordination Polymers
Gadolinium-based contrast agents (GBCAs) are the gold standard as MRI probes but are nowadays facing medical limitations and environmental concerns. To address these issues, novel strategies focus on the optimization of Gd(III)-based probes. One promising approach involves incorporating Gd(III) into nanoparticles, particularly coordination polymers, which offer improved relaxivity. In this study, we explore the self-assembly of Gd(III) ions with ascorbate ligand, forming extended coordination polymer architectures. Our investigation focuses on understanding the impact of nanoparticles’ growth and aggregation on their relaxivity properties. Notably, the controlled aggregation process leads to a different distribution of the Gd(III) in the surface and in the bulk of the nanoparticles, mainly responsible for their longitudinal relaxivity. Additionally, the introduction of Eu(III) into the network enables the development of a dual-modal probe with paramagnetic and optical features.
Journal Article
Shape Memory Polymers as Smart Materials: A Review
Polymer smart materials are a broad class of polymeric materials that can change their shapes, mechanical responses, light transmissions, controlled releases, and other functional properties under external stimuli. A good understanding of the aspects controlling various types of shape memory phenomena in shape memory polymers (SMPs), such as polymer structure, stimulus effect and many others, is not only important for the preparation of new SMPs with improved performance, but is also useful for the optimization of the current ones to expand their application field. In the present era, simple understanding of the activation mechanisms, the polymer structure, the effect of the modification of the polymer structure on the activation process using fillers or solvents to develop new reliable SMPs with improved properties, long lifetime, fast response, and the ability to apply them under hard conditions in any environment, is considered to be an important topic. Moreover, good understanding of the activation mechanism of the two-way shape memory effect in SMPs for semi-crystalline polymers and liquid crystalline elastomers is the main key required for future investigations. In this article, the principles of the three basic types of external stimuli (heat, chemicals, light) and their key parameters that affect the efficiency of the SMPs are reviewed in addition to several prospective applications.
Journal Article
Coordination Polymer Based on a Triangular Carboxylate Core Fesub.6 and an Aliphatic Diamine
Interaction of the pre-organized complex of iron(II) trimethylacetate and 1,10-phenanthroline (phen) [Fe[sub.2](piv)[sub.4](phen)[sub.2]] (1) (piv = (Me)[sub.3]CCO[sub.2] [sup.−])) with 1,6-diaminohexane (dahx) in anhydrous acetonitrile yielded a 1D coordination polymer [Fe[sub.3]O(piv)[sub.6](dahx)[sub.1.5]]n (2) and an organic salt of pivalic acid (H[sub.2]dahx)(piv)[sub.2] (3). The structure of the obtained compounds was determined by single-crystal X-ray diffraction analysis. The phase purity of the complexes was determined by powder X-ray diffraction analysis. According to the single-crystal X-ray analysis, coordination polymer 2 is formed due to the binding of a triangular carboxylate core Fe[sub.3](μ[sub.3]-O)(μ-piv)[sub.6] with an aliphatic diamine ligand. Thermal behavior was investigated for compounds 1 and 2 in an argon atmosphere.
Journal Article
Special Issue: “Smart and Functional Polymers”
Polymerization provides an efficient strategy for synthesizing macromolecules with versatile functionality [...].Polymerization provides an efficient strategy for synthesizing macromolecules with versatile functionality [...].
Journal Article
Correction: Azevedo et al. Selective Elastane Removal Using DMSO-DBN Under Moderate Temperatures: From Pure Filaments to Cotton/Polyester Blends. Polymers 2025, 17 , 3247
Ana Isabel Ribeiro was not included as an author in the original publication [...].
Journal Article
Statistical Analysis of Copperalkane-Based Complexes and Coordination Polymers
The prediction of the metal cluster within a coordination polymer or complex, as well as the dimensionality of the resulting polymer or complex (i.e., 0D, 1D, 2D, or 3D), is often challenging. This is the case for Ph[sub.2]P(CH[sub.2])[sub.m]PPh[sub.2] ligands (1 ≤ m ≤ 8) and CuX salts, particularly for X = I. This work endeavors a systematic statistical analysis combining studies in the literature and new data, mapping the nature of the resulting CuI aggregates with eight different diphoshphines in 2:1, 3:2, 1:1, 2:3, and 1:2 CuI:Ph[sub.2]P(CH[sub.2])[sub.m]PPh[sub.2] molar ratios as a function of m, which lead to either pure products or mixtures. Several trends are made relating stoichiometry and chain length to the CuI cluster formed (i.e., globular vs. quasi-planar). Four new X-ray structures were determined: [Cu[sub.3]I[sub.2](L1)[sub.3]]I, Cu[sub.3]I[sub.3](L2)[sub.2], Cu[sub.2]I[sub.2](L6)[sub.2], and Cu[sub.4]I[sub.4](L8)[sub.2], where m is, respectively, 1, 2, 6, and 8, in which the Cu[sub.x]I[sub.y] central aggregates adopt triangular bipyramid, diamond, rhomboid, and cubane shaped motifs, respectively. Photophysical measurements assisted the establishment of trends considering the paucity of the crystallographic structures. During this study, it was also found that the 0D-complex Cu[sub.2]I[sub.2](Ph[sub.2]P(CH[sub.2])[sub.5]PPh[sub.2])[sub.2] exhibits thermally activated delayed fluorescence.
Journal Article