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However, it is still unclear precisely how THz signals can be manipulated by various materials. Herein, we report the design and synthesis of four coordination networks, {[Fe\n                    <jats:sub>2<\/jats:sub>\n                    (Xpz)\n                    <jats:sub>2<\/jats:sub>\n                    ][Hg(SCN)\n                    <jats:sub>4<\/jats:sub>\n                    ]\n                    <jats:sub>2<\/jats:sub>\n                    [Hg(SCN)\n                    <jats:sub>2<\/jats:sub>\n                    ]}\n                    <jats:sub>n<\/jats:sub>\n                    (Xpz = fluo140ropyrazine,\n                    <jats:bold>1\u2010F<\/jats:bold>\n                    ; Xpz = chloropyrazine,\n                    <jats:bold>1\u2010Cl<\/jats:bold>\n                    ; Xpz = bromopyrazine,\n                    <jats:bold>1\u2010Br<\/jats:bold>\n                    ) and {[Fe(Ipz)][Hg(SCN)\n                    <jats:sub>4<\/jats:sub>\n                    ]}\n                    <jats:sub>n<\/jats:sub>\n                    (Ipz = iodopyrazine,\n                    <jats:bold>1\u2010I<\/jats:bold>\n                    ) as tunable THz absorbers.\n                    <jats:bold>1\u2010Cl<\/jats:bold>\n                    and\n                    <jats:bold>1\u2010Br<\/jats:bold>\n                    form isostructural three\u2010dimensional frameworks closely related to\n                    <jats:bold>1\u2010F<\/jats:bold>\n                    , differentiated in the Xpz ligand orientation. In contrast,\n                    <jats:bold>1\u2010I<\/jats:bold>\n                    adopts a distinct two\u2010dimensional framework due to the more sterically demanding halogen. Clear differences are observed in the sub\u2010THz (&lt; 1 THz) absorption features between the four materials, with the lowest features shifting to lower frequencies from\n                    <jats:bold>1\u2010F<\/jats:bold>\n                    to\n                    <jats:bold>1\u2010Br<\/jats:bold>\n                    . As these materials contain open\u2010shell high\u2010spin Fe(II) ions, we show that the application of a magnetic field can precisely modulate low\u2010frequency (LF) Raman bands by ca. 0.06 THz\/T at 4 K in the THz range. We show using Raman magnetospectroscopy (RAMS) that this tunability arises from the zero\u2010field splitting (ZFS) of Fe(II).\n                  <\/jats:p>","DOI":"10.1002\/anie.1927294","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T14:32:31Z","timestamp":1791297151000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tunable Raman Scattering of Fe(II) Coordination Networks With Magnetic Fields"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5168-7998","authenticated-orcid":false,"given":"Guanping","family":"Li","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Manchester  Manchester UK"},{"name":"Department of Chemistry School of Science The University of Tokyo  Bunkyo\u2010ku Tokyo 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University of Tokyo  Bunkyo\u2010ku Tokyo Japan"},{"name":"DYNACOM (Dynamical Control of Materials) \u2013 IRL2015 CNRS The University of Tokyo  Bunkyo\u2010ku Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8604-0171","authenticated-orcid":false,"given":"Nicholas F.","family":"Chilton","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Manchester  Manchester UK"},{"name":"Research School of Chemistry The Australian National University  Canberra ACT 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