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Open research questions in Metal complexes synthesis and properties

198 gap statements mined from Metal complexes synthesis and properties papers in our 7.9M-paper local library, which holds 1,266 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Moreover, the exact target of α-terthiophene in living organisms remains unclear, despite some leads such as DNA and RNA intercalations and lipid membrane and protein interactions (PKC-α, PKC-SS2, amyloid proteins, VEGFR-2).

    The Terthiophene Structural Motif: A Biological Asset or a Simple Ornament? · 2026 · DOI

  • Future work will address these points through cyclic degradation tests on an immobilised form of the catalyst, scavenger and EPR studies, TOC monitoring, matched-condition kinetic comparisons of the two dyes, ligand modification to extend absorption into the visible region, and validation with real textile wastewater.

    Photocatalytic Degradation of Methylene Blue and Rhodamine B by Mononuclear Copper (II) Complex with Phenanthroline-Based Ligand · 2026 · DOI

  • Gallium therefore represents the most advanced example of how preclinical metal-based antibacterial pharmacology can be connected to human exposure, although its efficacy and applicability beyond this specific clinical context remain to be established. A nogo decision is warranted when efficacious infection-site exposure cannot be achieved without unacceptable host toxicity or tissue accumulation.

    Metalloantibiotics Against ESKAPE Pathogens: Bridging Antibacterial Activity and Clinical Translation · 2026 · DOI

  • The need for alternative therapeutic agents that can overcome cisplatin resistance. The lack of understanding of the mechanisms underlying cisplatin resistance.

    Ru3: a novel ruthenium-based compound overcomes cisplatin resistance in non-small cell lung cancer via the E2F2-IGFBP3-GPX4 pathway · 2026 · DOI

  • UV-Vis detection based on cisplatin absorbance is simple and inexpensive; however, its application is limited because UV signals can be affected by interference from NPs, solvents, and other factors. Given this, the OPDA method efficiently bridges the gap between direct UV absorbance measurement, HPLC, and elemental analysis.

    Quantification of Cisplatin Encapsulated in Nanomedicine: An Overview · 2025 · DOI

  • To fully establish the therapeutic viability and safety profile of IA and its complexes, future research is proposed to further enhance the bioactivity and reduce the potential side effects of IA. Therefore, the synthesis and evaluation of additional derivatives should be continued.

    Design, Synthesis, Anti-Inflammatory Activity, DFT Modeling and Docking Study of New Ibuprofen Derivatives · 2024 · DOI

  • While the precise molecular targets and mechanisms of action remain incompletely understood, several potential mechanisms have been proposed and are discussed in this article.

    Copper Complexes: Main Mechanisms as Anticancer Agents · 2026 · DOI

  • This outcome could be an essential marker of the complex 1 efficacy, providing a basis for further investigation into its therapeutic potential against these types of cancers.

    Ru(II) Complexes with 3,4-Dimethylphenylhydrazine: Exploring In Vitro Anticancer Activity and Protein Affinities · 2025 · DOI

  • Still, it needs to be explored thoroughly how properties of metal ions such as size, charge, valence state, electron configuration, and reduction potential affect the cross-linking and assembly of materials.

    Metal–Flavonoid Interactions—From Simple Complexes to Advanced Systems · 2024 · DOI

  • The therapeutic implications are profound, warranting further exploration of their antioxidant mechanisms alongside their antiproliferative effects.

    Thiosemicarbazone-Based Compounds: Cancer Cell Inhibitors with Antioxidant Properties · 2025 · DOI

  • Because of its highest activity against HeLa, A-549, U-2 OS, and HepG2 cell lines, 26 was selected for further study of its mechanism of action on these four cell lines.

    Multifaceted biological and computational assessment of aromatic and N-heteroaromatic non-substituted thiosemicarbazones · 2026 · DOI

  • Only four metal ions (Mn(II), Cu(II), Cd(II), and Zr(IV)) were investigated; exploration of other transition metals and their chelate complexes with this ligand system remains unexplored.

    Structure elucidation and evaluation of the antimicrobial and antitumor activities of 5-methylthiazole-based Schiff base and its metal chelates · 2026 · DOI

  • Future studies can investigate the experimental validation of the computational findings. Research can focus on the application of GNA in synthetic biology, biotechnology, medicinal chemistry, and nanotechnology. Further studies can explore the use of other computational methods and models to investigate GNA properties.

    Conformational, molecular, spectral and binding properties of Zn(II)-coordinated glycol nucleic acid monophosphate: a DFT, docking and molecular dynamics assessment · 2026 · DOI

  • There is a need to synthesize and characterize new Schiff base ligands and their metal complexes. There is a need to investigate the nonlinear optical properties and antibacterial activity of these complexes.

    Synthesis, characterization, computational and biological investigation of Co(II), Ni(II) and Cu(II) complexes with 2-hydroxy-1-naphthaldehyde derived Schiff base ligand · 2026 · DOI

  • The lack of understanding of the biological potential of ceftiofur-based drugs. The need for further research on the coordination chemistry of cephalosporin antibiotics.

    Synthesis, Spectroscopic Characterization, Antioxidant Activity, and Molecular Docking Studies of Novel Ceftiofur-Based Metal Complexes · 2026 · DOI

  • Future research could focus on the synthesis and characterization of more oxidozirconium(IV) hydroxamate complexes. Future research could investigate the antimicrobial activity of these complexes in more detail.

    Synthesis, characterization, computational chemistry and biological studies of oxidozirconium (IV) hydroxamate complexes · 2026 · DOI

  • There is a need to synthesize and characterize new oxidozirconium(IV) hydroxamate complexes. There is a need to determine the antimicrobial potential of these complexes.

    Synthesis, characterization, computational chemistry and biological studies of oxidozirconium (IV) hydroxamate complexes · 2026 · DOI

  • The need for earth-abundant and low-cost metal-based systems with tunable electronic structures and photophysical properties. The limited understanding of the relationship between ligand substitution and photophysical properties in Cu(I) complexes. The lack of Cu(I) complexes with functionalized dipyridylamine ligands and DPEphos.

    Toward Photoactivatable Copper(I) Anticancer Agents: Heteroleptic Cu(I) Complexes with Functionalized Dipyridylamine Ligands · 2026 · DOI

  • Although the investigated Pd(II) complexes have so far been evaluated only in solution, the final pharmaceutical formulation has not yet been established, since the present study represents an early stage of preclinical development.

    Immunomodulatory and Antimicrobial Effects of Pd(II)-Pincer-Type Complex · 2026 · DOI

  • The rate of hydrolysis is influenced by factors such as spatial site resistance, pH, and pKa. When Pt(IV) compounds cross-link with DNA, they primarily form interstrand cross-linking (ICL) adducts. These cross-linking products have been observed to interact rapidly and directly with DNA, with the platinum compounds maintaining their Pt(IV) state in the products (Figure 5).

    Current Status of Novel Multifunctional Targeted Pt(IV) Compounds and Their Reductive Release Properties · 2024 · DOI

  • Accurate treatment of metalloproteins remains a challenging task in simulation studies. The use of polarization effects in MD simulation is computationally demanding. The study of GNA properties requires a detailed understanding of its dynamic behavior.

    Conformational, molecular, spectral and binding properties of Zn(II)-coordinated glycol nucleic acid monophosphate: a DFT, docking and molecular dynamics assessment · 2026 · DOI

  • A related open question is how these complexes would behave under mildly acidic aqueous conditions relevant to biological media…

    Synthesis, Elemental Analysis, and Mössbauer Characterization of Copper(II), Iron(III), Zinc(II), Manganese(II), and Chromium(III) Complexes of Bisantrene and Anthracen-9-Imidazoline Hydrazone · 2026 · DOI

  • Future research should focus on developing more robust liposomal formulations by optimizing lipid composition…

    Liposomal Formulations of Metallodrugs for Cancer Therapy · 2024 · DOI

  • Further investigation of the potential of imine-copper(II) and zinc(II) complexes as anticancer agents. Evaluation of the toxicity of these complexes in vivo. Investigation of the mechanisms of action of the complexes.

    Comparative reactivity studies of imine-copper(II) and zinc(II) complexes containing both oxindole and benzimidazole scaffolds for biomolecules and tumor cells · 2026 · DOI

  • The study aims to fill the gap in understanding the properties of Cu(II) complexes with amino acids. The study seeks to elucidate the coordination behavior between Cu(II) ions and glutamic acid ligands.

    Probing the structure and molecular docking of a Cu(II)-glutamic acid complex as a metallodrug agent using spectroscopic, electrochemical and theoretical studies · 2026 · DOI

Most-cited papers in Metal complexes synthesis and properties

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Open questions raised by papers listed on this page include: (1) The exact target of α-terthiophene in living organisms remains unclear, despite some leads such as DNA and RNA intercalations and lipid membrane and protein interactions (PKC-α, PKC-SS2, amyloid proteins, VEGFR-2) (“The Terthiophene Structural Motif: A Biological Asset or a Simple Ornament?”, 2026); (2) A nogo decision is warranted when efficacious infection-site exposure cannot be achieved without unacceptable host toxicity or tissue accumulation (“Metalloantibiotics Against ESKAPE Pathogens: Bridging Antibacterial Activity…”, 2026); (3) The lack of understanding of the mechanisms underlying cisplatin resistance (“Ru3: a novel ruthenium-based compound overcomes cisplatin resistance in…”, 2026); (4) Only four metal ions (Mn(II), Cu(II), Cd(II), and Zr(IV)) were investigated; exploration of other transition metals and their chelate complexes with this ligand system remains unexplored (“Structure elucidation and evaluation of the antimicrobial and antitumor…”, 2026); (5) Future studies can investigate the experimental validation of the computational findings (“Conformational, molecular, spectral and binding properties of…”, 2026). 198 gap statements have been mined from Metal complexes synthesis and properties papers in our 7.9M-paper local library, which holds 1,266 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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