Shape-Persistent Dendrimers

Lu, Yao-Chih; Anedda, Roberto; Lai, Long‐Li

doi:10.3390/molecules28145546

Cited by 6 publications

(3 citation statements)

References 66 publications

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“…Dendritic polymers are a class of polymers with 3D structures, so called because of the tree-like structures of their backbone with many ends [ 43 ]. Dendritic polymers are one of the most highly branched types of polymers having drawn much attention from scientists in many fields [ 44 ] due to their aesthetics and high symmetry of structures, extremely high functional group density on the surface, controllability of parameters such as molecular size and shape, as well as the uniqueness of their properties [ 45 ].…”

Section: Azobenzenementioning

confidence: 99%

Recent Development of Photochromic Polymer Systems: Mechanism, Materials, and Applications

Zou,

Liao,

et al. 2024

Research

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Photochromic polymer is defined as a series of materials based on photochromic units in polymer chains, which produces reversible color changes under irradiation with a particular wavelength. Currently, as the research progresses, it shows increasing potential applications in various fields, such as anti-counterfeiting, information storage, super-resolution imaging, and logic gates. However, there is a paucity of published reviews on the topic of photochromic polymers. Herein, this review discusses and summarizes the research progress and prospects of such materials, mainly summarizing the basic mechanisms, classification, and applications of azobenzene, spiropyran, and diarylethene photochromic polymers. Moreover, 3-dimensional (3D) printable photochromic polymers are worthy to be summarized specifically because of its innovative approach for practical application; meanwhile, the developing 3D printing technology has shown increasing potential opportunities for better applications. Finally, the current challenges and future directions of photochromic polymer materials are summarized.

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Section: Azobenzenementioning

confidence: 99%

Recent Development of Photochromic Polymer Systems: Mechanism, Materials, and Applications

Zou,

Liao,

et al. 2024

Research

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“…On the contrary, dendrimers comprising solely sp 2 or sp atoms exhibit a unique architectural rigidity, earning them the designation of "shape-persistent dendrimers". Unlike their traditional counterparts, these shape-persistent dendrimers display an array of distinct characteristics [68]:…”

Section: Shape-persistent Dendrimersmentioning

confidence: 99%

Dendrimers: Exploring Their Wide Structural Variety and Applications

Pérez-Ferreiro,

M. Abelairas,

Criado

et al. 2023

Polymers

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Dendrimers constitute a distinctive category of synthetic materials that bear resemblance to proteins in various aspects, such as discrete structural organization, globular morphology, and nanoscale dimensions. Remarkably, these attributes coexist with the capacity for facile large-scale production. Due to these advantages, the realm of dendrimers has undergone substantial advancement since their inception in the 1980s. Numerous reviews have been dedicated to elucidating this subject comprehensively, delving into the properties and applications of quintessential dendrimer varieties like PAMAM, PPI, and others. Nevertheless, the contemporary landscape of dendrimers transcends these early paradigms, witnessing the emergence of a diverse array of novel dendritic architectures in recent years. In this review, we aim to present a comprehensive panorama of the expansive domain of dendrimers. As such, our focus lies in discussing the key attributes and applications of the predominant types of dendrimers existing today. We will commence with the conventional variants and progressively delve into the more pioneering ones, including Janus, supramolecular, shape-persistent, and rotaxane dendrimers.

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“…In this regard, dendrimer macromolecules are of particular interest. They are capable of acting as complexing agents and encapsulating "guest" molecules into their structure [1,2]; they can serve as molecular antennas for the absorption of light energy [3][4][5] and act as nanoporous materials; they are oriented in a magnetic field [6]; they have mesogenic and emissive properties [7][8][9]; and they have the ability to self-organize into supramolecular assemblies [10,11]. The main feature inherent Magnetochemistry 2024, 10, 38 2 of 20 in dendrimers of various chemical natures is the presence of a certain shape, size, and controlled functionality.…”

Section: Introductionmentioning

confidence: 99%

New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

Starichenko,

Vorobeva,

Gruzdev

et al. 2024

Magnetochemistry

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The branched complexes of Schiff bases with various iron(III) salts, named G2-[L2Fe]+A− (A− is NO3−, Cl−, PF6−), were synthesized using the condensation reaction between carbazole derivatives of salicylic aldehyde and N’-ethylethylenediamine and characterized by various spectroscopic methods (GPC, IR, 1H NMR, UV/Vis). The studies revealed that the coordination of the two ligand molecules to metal occurs through the nitrogen ions and oxygen atom of azomethine to form a homoleptic system. All the synthesized coordination compounds were examined for their thermal, optical, and magnetic features. Static magnetic measurements showed that only G2-[L2Fe]Cl was in a single-phase HS state, whereas the Fe(III) ions of G2-[L2Fe]NO3 and G2-[L2Fe]PF6 at room temperatures were in mixed low-spin (LS, S = 1/2) and high-spin (HS, S = 5/2) states: 58.9% LS/41.1% HS for G2-[L2Fe]NO3, 56.1% LS and 43.9% HS for G2-[L2Fe]PF6. All G2-[L2Fe]+A− complexes demonstrate antiferromagnetic exchange interactions between neighboring Fe(III) ions. The ground spin state at 2.0 K revealed a Brillouin contribution from non-interacting LS ions and a proportion of the HS Fe(III) ions not participating in AFM interactions: 57%, 18%, and 16% for G2-[L2Fe]Cl, G2-[L2Fe]NO3 and G2-[L2Fe]PF6, respectively. EPR measurements confirmed the presence of magnetically active HS and LS states of Fe(III) ions and made it possible to distinguish two HS types-with strong low-symmetry (I-type) and weak, distorted octahedral environments (II-type). It was shown that G2-[L2Fe]+A− complexes are magnetically inhomogeneous and consist of two magnetic sub-lattices: AFM-correlated chains in layers from the I-type HS Fe(III) centers and dynamic short-range AFM ordered LS/II-type HS Fe(III) centers in the paramagnetic phase located between the layers.

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Shape-Persistent Dendrimers

Cited by 6 publications

References 66 publications

Recent Development of Photochromic Polymer Systems: Mechanism, Materials, and Applications

Recent Development of Photochromic Polymer Systems: Mechanism, Materials, and Applications

Dendrimers: Exploring Their Wide Structural Variety and Applications

New Branched Iron(III) Complexes in Fluorescent Environment Created by Carbazole Moieties: Synthesis and Structure, Static Magnetic and Resonance Properties

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