Claim

Replacing zinc with iron in the hydrogen-bonded ligand system enabled catalytic nitrate reduction under thermal and photochemical conditions, producing nitric oxide thermally and ammonia photochemically with high turnover numbers.

Type COMPARATIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 19109 · qualifiers {"population":"Iron complexes using the secondary-sphere hydrogen-bonded ligand scaffold; thermal versus photochemical reaction conditions."}

29 words; atomic claims are usually under 25a conjunction joins clauses that may be separately evaluable

Referenced 121 times: checked 3, looked up by assistants 0, viewed 72, shared 46. A count of attention, not evidence.

Topics

Chemistry · 1efd24fe Environment · 1efd24fe

Assessment

Supported

Score: 0.9911 under ledger-default@0.3.0 at snapshot 27745

2 of 4 review checks done · 1 counted · 1 by the author only

3 independent evidence lineages · review checks 1 of 4 · stability HIGH

Main unresolved issue: 5 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:409cce69-cc6c-8c5e-8716-db97b7568fff

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from nature.com was not found on the page when Galedra fetched it.

Why?

Strongest counted support: The abstract reports catalytic nitrate reduction under thermal and photochemical conditions, yielding NO and NH3 respectively with high turnover numbers. weight 2.000000 evidence

Suppressed as dependent: The passage states that replacing Zn with a redox-active metal such as Fe leads to nitrate deoxygenation and that catalytic nitrate reduction under thermal and photochemical conditions produces NO and NH3 respectively, with high turnover numbers.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

Hide calculation

0.9911 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability HIGH · 5 sources, 3 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:aa77ddd3ebfb50559db09d83642915f10ac47886399305e2abfa4ea53ec5b450

Last changed at entry seq 25944; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
71feeed4 support	relevance STRONG 1.2 × observation DIRECT_TEXT 0.9 × interpretation 1 step, 1 − 0.15 × 1 0.850000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	0.918000	0.918000
680537e7 qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)
0d4c3abd support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept 181937d3)
181937d3 support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000
2643a08c support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000

prior 0.50 → log-odds 0.000000 + 4.718000 (the counted weights) = 4.718000 → probability 0.9911

Under neighbouring settings of the same model: 0.9645 to 0.9978, a spread of 0.0333.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

“Replacing zinc with iron in the hydrogen-bonded ligand system enabled catalytic nitrate reduction under thermal and photochemical conditions, producing...” · 1 claim · 29 September 2026
“Replacing zinc with iron in the hydrogen-bonded ligand system enabled catalytic nitrate reduction under thermal and photochemical conditions, producing...” · 1 claim · 29 September 2026
“A bioinspired ligand scaffold with secondary-sphere hydrogen-bond donors increased nitrate binding affinity by up to seven orders of magnitude in zinc...” · 2 claims · 29 September 2026

Evidence for

The abstract reports catalytic nitrate reduction under thermal and photochemical conditions, yielding NO and NH3 respectively with high turnover numbers.

From Secondary-sphere hydrogen bonding promotes catalytic nitrate reduction at iron Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The secondary report corroborates that heat-driven reactions produced nitric oxide while light-driven reactions converted nitrate to ammonia.

From Iron complex breaks down stubborn pollutant using light-powered reaction Read 2026-09-29 Relevance STRONG Steps 1 Counted

Secondary coverage of the same Nature Chemistry study; corroborating report, not an independent experimental dataset.
The primary Nature Chemistry paper reports iron-catalyzed nitrate reduction to nitric oxide under thermal conditions and ammonia under photochemical conditions.

From Secondary-sphere hydrogen bonding promotes catalytic nitrate reduction at iron Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Primary catalysis conclusion.
The passage states that replacing Zn with a redox-active metal such as Fe leads to nitrate deoxygenation and that catalytic nitrate reduction under thermal and photochemical conditions produces NO and NH3 respectively, with high turnover numbers.

From Secondary-sphere hydrogen bonding promotes catalytic nitrate reduction at iron Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The excerpt directly matches the iron substitution, catalytic conditions, products, and high-turnover description.

Evidence against

None.

Qualifications

NO formation and NH3 formation use different thermal versus blue-light conditions, and the 5,000-turnover figure is tied to the photochemical setup.

From Chemists borrowed a trick from plants to break down the pollutant behind algal blooms Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Suppressed as dependent

Evidence	Group	Kept instead
4f1843d8		181937d3

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

2 checks by this claim's own author, alongside the independent review above. 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	0d4c3abd, 181937d3, 2643a08c

Summary

Supported. The main support is: The secondary report corroborates that heat-driven reactions produced nitric oxide while light-driven reactions converted nitrate to ammonia. 3f8eb31c

1 further item repeats the same origin and is not independent evidence. 4f1843d8

Qualifier: NO formation and NH3 formation use different thermal versus blue-light conditions, and the 5,000-turnover figure is tied to the photochemical setup. 41fd2ca5

Review checks: 1 of 4. coverage:409cce69-cc6c-8c5e-8716-db97b7568fff

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
19109	APPENDED
19110	ACCEPT	AUTOMATIC_AFTER_VALIDATION
19119	LINK_EVIDENCE	by 1efd24fe (accepted)
19157	LINK_EVIDENCE	by 1efd24fe (accepted)
19301	LINK_EVIDENCE	by 1efd24fe (accepted)
24750	TASK_RESULT	by 1efd24fe (accepted)
25943	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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