Nanorings with copper(ii) and zinc(ii) centers: forcing copper porphyrins to bind axial ligands in heterometallated oligomers.

Chem Sci · 2016 · PMC5355962 · PMID 28451130

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a clear trendno p-value reported

Many factors contribute to relaxation rates, but a clear trend is observed when comparing oligomers with and without copper.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.