Coordination chemistry
CH···anion bonds that template zinc molecular knots
Open access · cc by · source: Europe PMC
Weak C–H···anion contacts in water/methanol steer a Zn(II) dynamic library toward a trefoil knot that binds two bromides in its cavity.
Study at a glance
- Design
- Other — Zn(II)-templated DFP/DAB assemblies (catenane/knot/link) with aqueous anion-binding studies
- N
- Supramolecular synthesis and binding — no sample N
- Population
- DFP–DAB–Zn(II) interlocked assemblies in MeOD/D2O
- Outcome
- CH···anion-mediated topology selection and aqueous anion binding
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
CH···anion interactions in MeOD/D2O mediate topology. Solid-state TK6+ holds two bromides via bipyridinyl C–H hydrogen bonds. Cavity ~130 Å3 fits two anions ≤2.5 Å. DFT dipole is 2.77 D (gas) and 4.97 D (water). TK6+ still binds anions in D2O.
Methodology
Authors assembled DFP + DAB with Zn(II), used anion templation and temperature to bias [2]catenane, trefoil knot TK6+ and Solomon link, solved TK6+ crystals with two bromides, computed ESP/dipole, and studied aqueous anion binding by NMR.
Limitations
A full aqueous Kd table for every anion under physiological salt is incomplete; TFA association mode could not be assigned by HOESY.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 8 empirical chemistry papers on coordination chemistry with isolated findings, rates or spectra rather than reviews.
Evidence for the claim as stated.
Weak C–H···anion contacts in water/methanol steer a Zn(II) dynamic library toward a trefoil knot that binds two bromides in its cavity.
Evidence for the claim as stated.
A crystal structure is a snapshot; solution speciation and fluxional ligands can differ.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A crystal structure is a snapshot; solution speciation and fluxional ligands can differ.
Related papers in this topic
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