{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T11:02:36Z","timestamp":1775818956104,"version":"3.50.1"},"reference-count":105,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2022,12,7]],"date-time":"2022-12-07T00:00:00Z","timestamp":1670371200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2022,12,7]],"date-time":"2022-12-07T00:00:00Z","timestamp":1670371200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Biol Inorg Chem"],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The visible and M\u00f6ssbauer spectra of [Fe(II)(Por)L<jats:sub>2<\/jats:sub>] and [Fe(II)(Por)L(CO)] complexes (where Por\u2009=\u2009protoporphyrin IX (PPIX) or tetra(<jats:italic>p<\/jats:italic>-sulfophenyl)porphyrin (TPPS) and L\u2009=\u2009an aliphatic or aromatic nitrogenous base) are reported and discussed. The results are compared to those of previously reported [Fe(II)(Por)L(CO)] complexes (where Por\u2009=\u2009PPIX, TPPS, PMXPP, TPP, OMTBP and OEP; L\u2009=\u2009a nitrogenous aromatic ligand) and HbCO (where Hb\u2009=\u2009haemoglobin) and MyCO (where My\u2009=\u2009myoglobin). A new approach, to extracting information from the M\u00f6ssbauer parameters has been developed by plotting those of the [Fe(II)(Por)L<jats:sub>2<\/jats:sub>] complexes against those of [Fe(II)(Por)L(CO)] complexes for the same ligands, has yielded a series of trend lines that show a significant dependence on both the nature of the porphyrin and also of the nitrogenous ligand. Different trend lines were found for aromatic nitrogenous ligands to aliphatic nitrogenous ligands showing that the porphyrins could donate different amounts of charge to the Fe(II) cations as the L ligand changed, and hence, they display electron sink properties. From the plots, it was shown that haemoglobin and myoglobin both bind CO very strongly compared to the model complexes studied herein. Using the reported structural and M\u00f6ssbauer data for the [Fe(II)(Por)L<jats:sub>2<\/jats:sub>] and [Fe(II)(Por)L(CO)] complexes, it proved possible and instructive to plot the M\u00f6ssbauer parameters against a number of the bond lengths around the Fe(II) cations. The interpretation of the resulting trend lines both supported and facilitated the extension of our findings enabling further understanding of the geometry of the bonding in CO haemoglobin and CO myoglobin.<\/jats:p>\n                <jats:p><jats:bold>Graphical abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s00775-022-01969-w","type":"journal-article","created":{"date-parts":[[2022,12,7]],"date-time":"2022-12-07T17:04:53Z","timestamp":1670432693000},"page":"65-84","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Studies on the binding of CO to low-spin [Fe(II)(Por)L2] complexes: an aid to understanding the binding of CO to haemoglobin and myoglobin"],"prefix":"10.1007","volume":"28","author":[{"given":"Jack","family":"Silver","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Golzar","family":"al-Jaff","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jehad A.","family":"Taies","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael T.","family":"Wilson","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"den Engelsen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"George R.","family":"Fern","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6512-9540","authenticated-orcid":false,"given":"Terry G.","family":"Ireland","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,12,7]]},"reference":[{"key":"1969_CR1","unstructured":"Antonini E, Brunori M (1971) Hemoglobin and myoglobin in their reactions with ligands. 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