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Open research questions in Supramolecular Chemistry and Complexes

26 unresolved questions extracted from the limitations and future-work sections of 84 Supramolecular Chemistry and Complexes papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Paddlewheel diruthenium complexes have shown promising activity against A{beta}42 aggregation and preformed fibril disaggregation, yet their molecular mode of action remains poorly understood.

    Charge-Driven Fibril Recognition and Covalent Disruption of Aβ42 byPaddlewheel Diruthenium Complexes · 2026 · DOI

  • Importantly, analogous γ‐CD‐mediated 2:2 complexation and associated photophysical features are also observed for a tetraphenylethylene‐based guest, indicating that this binding mode is not limited to a single chromophoric scaffold.

    γ‐Cyclodextrin‐Based 2:2 Host–Guest Complexes With Emergent Circularly Polarized Luminescence · 2026 · DOI

  • Crystal structures were obtained only from chloroform/n-hexane vapor diffusion at 3 °C; structural characterization of the cage conformers in the aqueous phase at physiologically relevant temperatures (37 °C) using techniques such as solution NMR or small-angle X-ray scattering (SAXS) is absent.

    Dynamically assembled photochromic cages operational in water with visible light · 2026 · DOI

  • Photoisomerization was achieved using discrete LED wavelengths (365–730 nm); the spectral response profile and photoisomerization efficiency across continuous wavelength ranges, particularly in the visible spectrum where aqueous light penetration is optimal, has not been comprehensively mapped.

    Dynamically assembled photochromic cages operational in water with visible light · 2026 · DOI

  • The CO2-mediated extraction protocol for transferring cage 5 into the aqueous phase has only been demonstrated at room temperature (22 ± 3 °C) with a fixed CO2 flow rate; the effects of temperature, CO2 concentration, and pH buffering on extraction efficiency and cage solubility remain uncharacterized.

    Dynamically assembled photochromic cages operational in water with visible light · 2026 · DOI

  • Photostability was evaluated over only ten irradiation cycles; extended cycling experiments (50+ cycles) combined with spectroscopic analysis of potential photodegradation byproducts would be needed to establish the long-term operational durability of the water-soluble photochromic cages.

    Dynamically assembled photochromic cages operational in water with visible light · 2026 · DOI

  • Thermal stability measurements were only conducted at 25 °C in the dark; the thermal degradation kinetics of the photochromic cage isomers at elevated temperatures (e.g., 37 °C, 50 °C) relevant to biological or device applications have not been systematically investigated.

    Dynamically assembled photochromic cages operational in water with visible light · 2026 · DOI

  • Biological and medical applications of MIMs are identified as a future direction, but specific concerns regarding biocompatibility, long-term effects in biological systems, cellular uptake mechanisms, and toxicity profiles of mechanically interlocked molecules in living organisms have not been systematically addressed.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • The design of autonomous molecular machines with multiple integrated MIM types operating multiresponsively remains largely unexplored; there is no systematic framework presented for combining different mechanically interlocked architectures to achieve programmable, sequential behavior mimicking natural molecular machines.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • The Outstanding Questions section identifies the need to determine how mechanical energy from MIM degrees of freedom can be transformed into other forms of energy and whether energy storage is a viable application, but no concrete examples or energy conversion pathways have been demonstrated in the literature cited.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • Mechanically interlocked molecule-based fluorescent mechanophores have been designed to detect external mechanical forces, but their application in detecting small forces within polymers and living cells requires validation through controlled force measurements and biocompatibility assessment in cellular environments.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • Sliding-ring polyrotaxanes have shown promise in modifying mechanical properties of polyacrylic acid polymers for lithium-ion battery applications, but systematic studies on how polyrotaxane composition, ring density, and interlocking geometry affect cycle lifetime and volume change accommodation in battery electrodes have not been detailed.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • The integration of mechanical bonds into macroscopic gel materials has been demonstrated with [c2]daisy chains and cyclodextrin-based artificial muscles in hydrogels, but the quantitative effect of mechanical bonds on the elastic and mechanical properties of bulk gel objects remains incompletely characterized across different gel compositions and environmental conditions.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • While mechanically interlocked molecules have been investigated in solution, their deposition onto substrates and the effect of thin films on molecular behavior must be understood properly for on-surface applications. Specifically, the switching behavior and orientation changes of rotaxane monolayers on various substrates (glass, silicon) need systematic investigation to enable multiresponsive multilayer surface design.

    The Burgeoning of Mechanically Interlocked Molecules in Chemistry · 2019 · DOI

  • The ligand crossover process observed between two homo-metallo-dynamer films at 50°C for 24 hours without solvent or catalyst suggests kinetic and thermodynamic factors controlling monomer exchange, but systematic kinetic studies characterizing the rates of constitutional metal-ligand exchange reactions, activation barriers, and equilibrium distributions as functions of temperature, metal identity, and ligand structure are absent.

    From Coordination Chemistry to Adaptive Chemistry · 2018 · DOI

  • The paper demonstrates that physical or chemical perturbations to CDNs cause ripple effects throughout the entire network affecting all constituents. However, systematic quantitative modeling of how perturbations propagate through agonistic/antagonistic networks and predictive frameworks for controlling selective constituent amplification in complex CDNs with multiple antagonistic relationships have not been developed.

    From Coordination Chemistry to Adaptive Chemistry · 2018 · DOI

  • Constitutional dynamic networks (CDNs) are described as establishing agonistic and antagonistic relationships between constituents, but quantitative methods for predicting and mapping these relationship networks a priori from component structures are not explicitly developed. Systematic methodologies for characterizing CDN topology and constituent interference patterns across diverse component sets need to be established.

    From Coordination Chemistry to Adaptive Chemistry · 2018 · DOI

  • The morphological switching mechanism between polymeric and macrocyclic states triggered by metal coordination has only been demonstrated using the specific dialdehyde 46 / diamine 47 / ZnII system. The generalizability of this coordination-triggered morphological conversion approach to other component architectures, metal ions, and dynamic covalent bond types remains unexplored.

    From Coordination Chemistry to Adaptive Chemistry · 2018 · DOI

  • Doubly dynamic polymers combining dynamic properties at both the supramolecular and molecular level remain limited in scope. The paper demonstrates one example using acylhydrazone-based metallodynamers with ZnII, NiII, CoII, and CdII cations, but systematic exploration of other metal cations, ligand architectures, and reversible covalent bond types (beyond acylhydrazone condensation) for constructing doubly dynamic polymers has not been comprehensively conducted.

    From Coordination Chemistry to Adaptive Chemistry · 2018 · DOI

  • While the paper discusses the transition from reversible to non-equilibrium evolutive chemistry involving constitutional dynamics, it provides no specific conditions, reaction schemes, or driving mechanisms for implementing and studying non-equilibrium constitutional dynamic networks experimentally.

    Constitutional Dynamic Chemistry: Bridge from Supramolecular Chemistry to Adaptive Chemistry · 2011 · DOI

  • The paper identifies sequential hierarchical self-organization with emergence of novel features at each scale and self-organization in both time and space as future directions, but provides no specific experimental designs or measurable parameters for detecting and characterizing multi-scale emergent properties in constitutional dynamic networks.

    Constitutional Dynamic Chemistry: Bridge from Supramolecular Chemistry to Adaptive Chemistry · 2011 · DOI

  • The passage proposes that constitutional dynamic libraries generate a superposition of all virtual constituents corresponding to initial component combinations, with conditions determining observable states, but lacks experimental strategies or analytical methods for comprehensively mapping and validating this virtual constituent space in real chemical systems.

    Constitutional Dynamic Chemistry: Bridge from Supramolecular Chemistry to Adaptive Chemistry · 2011 · DOI

  • The paper discusses weighted network analysis for defining states of complex chemical systems at multiple scales and mentions the conceptual relation to assembly-forming brain function, but does not provide concrete experimental or computational approaches for applying these weighted network methods to analyze and predict constitutional dynamic chemistry behavior in neural-inspired adaptive systems.

    Constitutional Dynamic Chemistry: Bridge from Supramolecular Chemistry to Adaptive Chemistry · 2011 · DOI

  • While the concept of agonistically related constituents amplifying each other while simultaneously promoting 'unfit' species is proposed as a general principle in CDNs, the paper lacks specific experimental protocols or computational models to systematically predict and exploit this phenomenon for directed amplification of minor constituents with desirable properties under defined effector conditions.

    Constitutional Dynamic Chemistry: Bridge from Supramolecular Chemistry to Adaptive Chemistry · 2011 · DOI

  • The paper describes connected evolution and coevolution processes in constitutional dynamic networks (CDNs) where feedback between substrate and receptor leads to simultaneous optimization of both species, but provides no experimental validation or quantitative framework for measuring the kinetics and thermodynamic parameters governing these coupled optimization dynamics in multi-component systems.

    Constitutional Dynamic Chemistry: Bridge from Supramolecular Chemistry to Adaptive Chemistry · 2011 · DOI

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26 open questions have been extracted from the limitations and future-work passages of 84 Supramolecular Chemistry and Complexes papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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