Primary source: pubmed.ncbi.nlm.nih.gov/35174648/

Verified locator: Primary indexed abstract, PMID 35174648: first protonation changes conformation and chromophore/substituent coupling, with large halochromic shifts in selected derivatives.

Open-access primary full text: pmc.ncbi.nlm.nih.gov/articles/PMC9259717/ , DOI 10.1002/advs.202105886. Figures 3–4 and their captions identify acid titrations in dichloromethane using trifluoroacetic acid, with sulfuric acid used for some higher protonation stages. The results show derivative-dependent multistage spectral responses rather than a universal two-species aqueous titration.

Verified locator: CHEBI:35692, Definition and ontology: carboxylic acids containing two carboxy groups; superclass carboxylic acid.

Primary source: cdn.caymanchem.com/cdn/insert/27089.pdf

Verified locator: Primary manufacturer product information, Item 27089, CAS 2383063-37-2, formula C19H17BF2N2 and formula weight 322.2. Description specifies monitoring absorbance loss at 571 nm during co-autoxidation. Product-specific information, not a universal BODIPY spectrum.

Primary source: pubchem.ncbi.nlm.nih.gov/compound/Dipyrrin

Verified locator: CID 3083424, primary indexed record: C9H8N2 and a pyrrole bearing a pyrrol-2-ylidenemethyl substituent. Indexed primary text verified; direct page reader encountered a browser check.

Primary source: iupac.qmul.ac.uk/tetrapyrrole/TP6n7.html

Verified locator: Official nomenclature web text, TP-6 and TP-7: retained dipyrromethane and introduced dipyrrin trivial names for 2,2-prime-linked pyrrole systems.

Muhammad N. Siddiquee and Arno de Klerk, Industrial & Engineering Chemistry Research 55(23), 6607–6618, 2016; published online 6 June 2016. The primary publisher abstract motivates direct in situ measurement of oxygen availability during liquid-phase hydrocarbon autoxidation and reports oxygen mass-transfer coefficients in benzene and indan at 50 degrees Celsius and oxygen partial pressure 19.2 kPa. The abstract is the verified locator; no unseen apparatus construction details are inferred.

Michael Kasha, Discussions of the Faraday Society9,14–19(1950). Original paper text inspected via scan at www.scribd.com/document/834716858/Kasha-1950 , not the host-generated summary. Printed p.14 abstract and p.15 Internal Conversion: relationship between radiationless transitions among states of like multiplicity and the lowest excited emitting level. These are spectroscopic regularities discussed for the studied molecules, not an assertion of an exception-free law.

Official Faculty of Science profile identifies Derek Pratt in Chemistry and Biomolecular Sciences, describes mechanisms and products of radical reactions and inhibition of hydrocarbon/lipid autoxidation, and lists publications under the exact byline Derek A. Pratt. The named portrait link is www.uottawa.ca/faculty-science/sites/g/files/bhrskd386/files/2022-08/D.Pratt_.jpg . No expansion of A. or birth date.

CHEBI:51123 defines a BODIPY dye by the 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene skeleton and links the broader BODIPY-compound class CHEBI:51108. Multiple substituted dyes are listed as members; the class does not have one universal molecular formula, absorption maximum or fluorescence yield.

CHEBI:30794, propanedioic acid; two carboxy groups separated by one methylene group, neutral formula C3H4O4, average mass 104.061, structure and conjugate-base relation.

CHEBI:15702, benzene-1,4-dicarboxylic acid; carboxy groups at ring positions 1 and 4, formula C8H6O4, average mass 166.132. The positional connectivity distinguishes it from the other benzenedicarboxylic-acid isomers.

CHEBI:16243, pentahydroxyflavone with hydroxy groups at 3,3-prime,4-prime,5,7; neutral formula C15H10O7, average mass 302.238, structural SMILES and flavonol relation.

PMID 26529543. Primary indexed byline: Evan A. Haidasz, Antonius T. M. Van Kessel and Derek A. Pratt. Abstract: visible-light spectrophotometric co-autoxidation of a hydrocarbon substrate and PBD-BODIPY or STY-BODIPY signal carrier, and distinction between reaction kinetics and trapping stoichiometry.

Journal of Organic Chemistry 81(3), 737–744 (5 February 2016); electronic publication 13 November 2015. DOI doi.org/10.1021/acs.joc.5b02183 . The indexed affiliation is Chemistry and Biomolecular Sciences, University of Ottawa. Optical examples in the linked author profiles are original illustrations rather than reported calibration constants.

Additional precise abstract fact: PBD-BODIPY is explicitly the 1-phenylbutadiene-conjugated carrier, while STY-BODIPY is the styrene-conjugated carrier. No extinction coefficient or molecular formula for PBD-BODIPY is inferred from these labels.

NIST Chemistry WebBook SRD69, flavone CAS525-82-6: formula C15H10O2, standard InChI and structure, with linked electron-ionization mass spectrum and UV/visible spectrum. Main identity section reports molecular weight 222.2387 under its atomic-weight convention; this small difference from the ChEBI average mass is not evidence of a different compound. No uninspected spectral peak assignment asserted.

CHEBI:42491: flavone, the unsubstituted 2-phenyl-4H-chromen-4-one molecule, formula C15H10O2, average mass 222.243, monoisotopic mass 222.06808 and CAS525-82-6. Distinguish this specific parent molecule from the wider class flavones, CHEBI:24043. Structure has a ring oxygen and a position-4 carbonyl, with phenyl substitution at position2.

Pradeep K. Sengupta and Michael Kasha, Chemical Physics Letters 68(2–3), 382–385 (15 December 1979). Original article scan text inspected at www.scribd.com/document/830831361/ESIPT ; use the article text, not the host-generated summary. Printed pp.382–383, Figures1–2: absorption maximum around 352 nm and green emission around 520 nm in 2-methylbutane at room temperature; Figure2 compares room-temperature tautomer fluorescence with violet fluorescence in a rigid 77 K matrix. Figure1 identifies a Cary15 spectrophotometer; Figure2 identifies a Varian SF330 spectrofluorimeter. Printed p.384 discusses excitation spectra and deuteration comparisons. The original byline gives both first names; no additional initials expanded.

Official UC Davis Viticulture and Enology profile identifies Andrew L. Waterhouse as Professor (Chemist), describes research in phenolic compounds and wine oxidation, and explicitly labels its portrait Dr. Andrew L Waterhouse. Named external portrait link: wineserver.ucdavis.edu/sites/g/files/dgvnsk2676/files/styles/sf_profile/public/images/person/Andy%20Waterhouse_002.jpg?h=c6416992&itok=S7WtuqpI . The profile is the identity/provenance context; no locally stored image.

Primary source: www.oecd.org/content/dam/oecd/en/publications/reports/1992/07/test-no-301-ready-biodegradability_g1gh2913/9789264070349-en.pdf

Verified locator: OECD Guideline for Testing of Chemicals 301, adopted 17 July 1992. Method 301 B, carbon-dioxide evolution test, §§1–3, printed p. 18: applicability to nonvolatile substances of known carbon content, CO2-free aeration, barium/sodium hydroxide traps and titration or inorganic-carbon measurement, with blank inoculum correction. General §§7–9 discuss composition and physical applicability.

Additional precise locator: General principle of the tests, paragraph 4, printed p. 1 of the 1992 guideline. Parallel inoculum blanks correct endogenous activity, but the guideline explicitly notes that endogenous activity with the test chemical will not exactly match the blank control. This distinction motivates separating blank sampling uncertainty from possible nonadditive background changes in polymer-carbon recovery.

Primary curated identity record: www.ebi.ac.uk/chebi/CHEBI:16510 . Definition and Ontology identify 3-hydroxypropionate as the conjugate base of 3-hydroxypropionic acid. Formula C3H5O3, net charge −1, Average Mass 89.070; IUPAC Name is 3-hydroxypropanoate. The dated record field Last Modified is 23 September 2015, not an inferred publication date.

Brent C. Trela and Andrew L. Waterhouse, Journal of Agricultural and Food Chemistry 44(5), 1253–1257 (16 May 1996), DOI 10.1021/jf9504576. Exact full byline and UC Davis Viticulture and Enology affiliation verified in the publisher indexed page. Abstract reports ethanol absorption maxima: trans-resveratrol 308 nm with molar absorptivity 30000, cis-resveratrol 288 nm with molar absorptivity 12600, in L mol^-1 cm^-1. Stability depends on illumination and pH. Original Table 2/Molar Absorptivities describes separate wavelength-dependent measurements; the two reported maxima are not the two coefficients at a single common wavelength.