Open research questions in History and advancements in chemistry
41 unresolved questions extracted from the limitations and future-work sections of 429 History and advancements in chemistry papers in our library. Each links back to the study that raised it.
What the literature leaves open
Despite IUPAC's recommendation to use the physics convention (dipole vector from negative to positive charge), the traditional chemistry convention remains unanimously followed in organic chemistry textbooks and has had only minor effect on general chemistry textbooks.
Electric dipole moment in chemistry: historical account and its representation in chemistry textbooks · 2025 · DOIWhile advances in microfluidic device manufacturing, superresolution imaging, and computational modeling of complex systems have enabled systems chemistry research, the paper does not specify validation methodologies or benchmarking standards needed to systematically characterize the behavior of interacting chemical networks away from equilibrium.
Systems chemistry, as an emerging field, requires investigation of molecular assemblies and chemical networks that operate away from equilibrium and demonstrate emergent functions. However, the paper does not specify which types of non-equilibrium systems (e.g., autocatalytic networks, dissipative structures, reaction-diffusion systems) should be prioritized for investigation or what specific emergent properties need characterization.
The 1970 Red Book retained the name ferrum(III) chloride alongside modern iron(III) chloride nomenclature, acknowledging that ferrum(III) has never been used in practice, but no systematic analysis is provided of other obsolete nomenclature forms persisting in coordination chemistry recommendations and their actual usage prevalence in the literature.
The naming of coordinated tetrapyrrole ligands (porphyrins, chlorophylls) underwent revision between the 2000 and 2005 recommendations to reflect organic chemistry recommendations, but the manuscript is truncated before explaining what specific nomenclature consequences resulted from these changes or whether they adequately address metal coordination effects on tetrapyrrole parent structure names.
The 2005 recommendations changed halide and other ligand names (e.g., fluoride to fluorido, chloride to chlorido) to standardize nomenclature, but no comparative analysis is provided examining whether the new -ido/-ito/-ato endings improve ligand name recognition and retention among coordination chemists compared to the historically established forms.
The kappa-notation (κ-nomenclature) for identifying coordination atoms in ligands is noted as undergoing active and ongoing revision by IUPAC committees, particularly regarding desymmetrization effects in coordination chemistry, but the specific cases where current κ-notation fails to unambiguously specify coordination modes in multidentate ligand systems have not been documented.
The 2000 recommendations for coordination polymers identified that names with high information content could not always be easily deconstructed to regenerate structures, and highlighted the need for numbering systems in polynuclear systems and bridging ligands, but specific algorithmic procedures or software tools for unambiguously generating and parsing coordination polymer names remain unspecified.
The 1970 Red Book nomenclature rules began to address stereochemical nomenclature for coordination compounds beyond simple cis- and trans- prefixes, but the approach was significantly revised in the 1990 recommendations without documented evaluation of which stereochemical descriptor system (polyhedral symbol notation vs. alternative approaches) most effectively communicates three-dimensional structural information for coordination entities.
The catalyst recycling stability and separation efficiency of heterogenized PtII triazine-based systems requires quantitative testing across multiple reaction cycles to establish maximum recyclability limits and activity retention profiles for direct industrial alkane oxidation processes.
Early observations of H/D exchange in CH4 with Cp2Ni-LiAlH4 system suggesting Ni-CH3 intermediate formation were not continued; this work requires resumption with modern spectroscopic characterization to establish the intermediate's structure and role in alkane platinum chemistry mechanistic pathways.
The role of steric hindrance from porphyrinoid ligands in determining methane vs. higher alkane reactivity selectivity in Ni-F430 enzyme and rhodium porphyrin complexes has been observed but not systematically characterized through structure-activity relationship studies of metal-alkane interactions.
The mechanism of anaerobic methane oxidation by MCR enzyme remains unresolved between competing hypotheses: DFT calculations exclude electrophilic Ni(III) metallation of methane, but alternative radical-based H abstraction mechanisms are also thermodynamically infeasible given methane's C-H bond strength (~106 kcal/mol). The proposed concerted cleavage mechanism involving thiyl radical coM-S· and Ni(I) center requires experimental validation.
The heterogenized PtII complex catalytic system with triazine-based framework (2) for methane oxygenation achieves the highest catalytic rate but requires investigation of methods to mitigate the corrosive medium conditions and reduce the relatively high temperatures needed for alkane platinum oxidation reactions.
The paper discusses computational chemical models as 'overt' alternatives to bench-top reactions but does not investigate whether wave function-based computational models that generate quantitative predictions satisfy different criteria for law-likeness than qualitative chemical equations. The relationship between Berzelian mechanistic explanations and quantum mechanical computations in grounding chemical necessity remains unexamined.
The paper argues that chemical equations are not causal laws in Mackie's INUS conditions framework, yet claims they achieve law-likeness through mechanistic explanation. The paper does not formally specify what ceteris paribus conditions are actually invoked by chemists when writing equations or how these implicit conditions differ systematically across reaction types, reaction conditions (temperature, pressure, solvent), and experimental contexts.
The paper identifies a fundamental ontological tension in chemical modeling: Berzelian ion-particle mechanics versus wave function field ontologies for computing molecular attributes, but defers resolution by stating 'that again is matter for another occasion.' A concrete investigation of how chemists choose between particulate entity representations and field-based wave function descriptions when modeling specific molecular structures would clarify which ontological framework better grounds chemical law-likeness.
The paper establishes that electron and proton transfer mechanisms provide modal status to chemical equations through Berzelian electrostatic bonding theory, but does not systematically investigate how this mechanistic explanation applies across different classes of chemical reactions beyond double replacement and acid-base reactions. A comprehensive empirical survey comparing electron transfer mechanisms in redox reactions, nucleophilic substitutions, and elimination reactions would test whether the modal necessity argument generalizes.
Land-use-change albedo forcing shows a cooling effect of −0.2 W m−2, but this aggregates diverse changes (deforestation, desertification, agricultural expansion) without specifying regional contributions or temporal dynamics since 1750. Satellite albedo time series linked to specific land-cover transitions are needed to validate these estimates.
Contrails are noted to have a warming effect where water vapor forcing outweighs albedo cooling, but the paper provides no mechanistic model for how contrail properties (optical depth, lifetime, altitude, ice crystal size) vary with atmospheric conditions or how this translates to climate forcing at different latitudes and times of day.
The post-World War II industrial aerosol cooling effect is identified using low-resolution global temperature data, but the paper does not quantify the separate contributions of sulfate aerosol, soot, organic carbon, nitrate, and mineral dust to direct aerosol forcing. Region-specific quantification of aerosol radiative forcing by composition and source is needed.
Ocean albedo is noted as highly variable (typically <0.2) depending on solar zenith angle, wind speed, and chlorophyll concentration, but the paper does not quantify how changes in ocean phytoplankton concentration or optical properties since 1750 have contributed to radiative forcing. A systematic analysis linking oceanographic changes to albedo forcing is absent.
The soot-on-snow albedo effect is described as involving positive feedback with surface warming, but the paper provides no quantitative relationship between black carbon deposition rate, snow albedo reduction, and temperature response. Specific measurements of black carbon concentration on snow in different regions and seasons are needed to model this forcing mechanism.
The mechanism by which stratospheric water vapor concentrations increased 50% in the latter half of the 20th century is incompletely understood. The paper identifies two potential sources—methane oxidation and water vapor transport via tropical convective storms—but lacks quantitative partitioning between these mechanisms and does not specify which datasets or atmospheric models could resolve this ambiguity.
The indirect aerosol effect shows a Level of Scientific Understanding (LOSU) of 'L' (low) with a large uncertainty range of −1.8 to −0.3 W m−2. The paper lacks specific quantification of how cloud condensation nuclei concentration changes affect cloud optical properties and planetary albedo across different cloud types, altitudes, and regional pollution regimes.
Most-cited papers in History and advancements in chemistry
- What Can Topology Bring to Chemistry? · CCS Chemistry · 2024 · 55 citations
- Introducing Communications Chemistry · Communications Chemistry · 2018 · 45 citations
- Shilov alkane platinum chemistry: 45 years · Journal of Organometallic Chemistry · 2015 · 29 citations
- A child of prediction. On the History, Ontology, and Computation of the Lennard-Jonesium · Studies in History and Philosophy of Science Part A · 2023 · 18 citations
- What’s in a Name?—A Short History of Coordination Chemistry from Then to Now · Chemistry · 2019 · 17 citations
- Counting Perfect Matchings in Hexagonal Systems Associated with Benzenoids · Mathematics Magazine · 2001 · 9 citations
- Relativistic effects on the chemistry of heavier elements: why not given proper importance in chemistry education at the undergraduate and postgraduate level? · Chemistry Teacher International · 2023 · 8 citations
- f-Block Chemistry · 2020 · 6 citations
- Book Review: Evan James Williams—Atomic Physicist · Physics Education · 2023 · 6 citations
- Early theoretical chemistry: Plato’s chemistry in Timaeus · Foundations of Chemistry · 2021 · 4 citations
Most recent work
- The acid-base concept in modern supramolecular chemistry · Coordination Chemistry Reviews · 2026
- The early history of Hungarian quantum chemistry: From physics to applications in chemistry and biology · Advances in Quantum Chemistry · 2026
- Fifty-five years of quantum chemistry · Advances in Quantum Chemistry · 2026
- A modern “Skeptical chemist”: How Angelo Gavezzotti contributed to our understanding of molecular crystals · Structural Chemistry · 2026
- Pauling’s Second Rule and Its Applications: From Inorganic Compounds to Understanding the Function of ATP · Reports of NAS RA · 2026
- Dimensional Chemistry: The Geometric Origin of Molecular Orbitals, VSEPR Dynamics, and Nuclear Periodicity · Zenodo (CERN European Organization for Nuclear Research) · 2026
- The Seasons of a Career in Physical Chemistry: Olivia Harper Wilkins · ACS Physical Chemistry Au · 2026
- D-exp-MP01: PDL Structural Lacunae Confirmed by Materials Project Database Scan — Technetium and Promethium as Combinatorial Impossibilities (Projective Dynamic Logo Framework, Exploratory Document) · Zenodo (CERN European Organization for Nuclear Research) · 2026
- «European Research Materials» (June 4-5, 2026). Amsterdam, Netherlands, 2026. 308p · Zenodo (CERN European Organization for Nuclear Research) · 2026
- Chemists ran 50,688 reactions to make a huge open dataset · Chemical & Engineering News · 2026
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