{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T19:01:16Z","timestamp":1782414076866,"version":"3.54.5"},"reference-count":48,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2022,11,13]],"date-time":"2022-11-13T00:00:00Z","timestamp":1668297600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004281","name":"National Science Centre, Poland","doi-asserted-by":"publisher","award":["2020\/39\/O\/NZ7\/00351"],"award-info":[{"award-number":["2020\/39\/O\/NZ7\/00351"]}],"id":[{"id":"10.13039\/501100004281","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004281","name":"National Science Centre, Poland","doi-asserted-by":"publisher","award":["UDA-POIG.02.01.00-30-182\/09"],"award-info":[{"award-number":["UDA-POIG.02.01.00-30-182\/09"]}],"id":[{"id":"10.13039\/501100004281","id-type":"DOI","asserted-by":"publisher"}]},{"name":"European Fund for Regional Development","award":["2020\/39\/O\/NZ7\/00351"],"award-info":[{"award-number":["2020\/39\/O\/NZ7\/00351"]}]},{"name":"European Fund for Regional Development","award":["UDA-POIG.02.01.00-30-182\/09"],"award-info":[{"award-number":["UDA-POIG.02.01.00-30-182\/09"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Iron(III) porphyrazines containing peripheral 2,5-dimethyl-, 2-methyl-5-phenyl-, and 2,3,5-triphenyl-1H-pyrrol-1-yl substituents were synthesized and subjected to physicochemical characterization. This was accomplished by high-resolution mass spectrometry, nuclear magnetic resonance (as diamagnetic Fe(II) derivatives), HPLC purity analysis, and UV-Vis spectroscopy, accompanied by the solvation study in dichloromethane and pyridine. X-ray structure analysis was performed for a single crystal of the previously obtained 2,5-diphenyl-substituted derivative of porphyrazine complex (5d). The octahedral geometries of iron cation, present in the porphyrazine core, influenced the packing mode of molecules in the crystals. M\u00f6ssbauer studies, performed for solid samples of iron porphyrazines, indicated that low-spin reduced iron states might occupy low- or high-symmetry binding sites. It was found that the hyperfine parameters and the subsequent contribution of the iron cations depend on the number of phenyl groups surrounding the pyrrolyl moiety. For iron(II) porphyrazine 2,3,5-triphenylpyrrol-1-yl substituents (5b), a high-spin ferrous state fraction was observed. Temperature-dependent measurements showed that the freed rotation of the peripheral porphyrazine ligands and the increased flexibility of the macrocycle ring result in the Fe2+ ion being stabilized in a diamagnetic state at a binding site of high symmetry at room temperature in the solid state. This process is most probably stimulated by the range of collective motions of the polymeric ribbons consisting of iron(II) porphyrazines observed in the X-ray.<\/jats:p>","DOI":"10.3390\/molecules27227820","type":"journal-article","created":{"date-parts":[[2022,11,14]],"date-time":"2022-11-14T04:24:10Z","timestamp":1668399850000},"page":"7820","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The Valence and Spin State Tuning of Iron(II\/III) Porphyrazines with Bulky Pyrrolyl Periphery in Solution and Solid State"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8446-4758","authenticated-orcid":false,"given":"Tomasz","family":"Koczorowski","sequence":"first","affiliation":[{"name":"Chair and Department of Chemical Technology of Drugs, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0798-4626","authenticated-orcid":false,"given":"Wojciech","family":"Szczolko","sequence":"additional","affiliation":[{"name":"Chair and Department of Chemical Technology of Drugs, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0831-2856","authenticated-orcid":false,"given":"Pawel","family":"Bakun","sequence":"additional","affiliation":[{"name":"Chair and Department of Chemical Technology of Drugs, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2254-2508","authenticated-orcid":false,"given":"Barbara","family":"Wicher","sequence":"additional","affiliation":[{"name":"Chair and Department of Chemical Technology of Drugs, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5062-4503","authenticated-orcid":false,"given":"Lukasz","family":"Sobotta","sequence":"additional","affiliation":[{"name":"Chair and Department of Inorganic and Analytical Chemistry, Poznan University of Medical Sciences, Rokietnicka 3, 60-806 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8249-7193","authenticated-orcid":false,"given":"Maria","family":"Gdaniec","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Pozna\u0144skiego 8, 61-614 Poznan, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3918-712X","authenticated-orcid":false,"given":"Anna","family":"Teubert","sequence":"additional","affiliation":[{"name":"Institute of Bioorganic Chemistry, Polish Academy of Sciences, Z. 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