Synthesis and Structural Elucidation of Co(II) and Mn(II) Coordination Polymers Derived from Isonicotinic Acid

Synthesis and Structural Elucidation of Co(II) and Mn(II) Coordination Polymers Derived from Isonicotinic Acid | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Synthesis and Structural Elucidation of Co(II) and Mn(II) Coordination Polymers Derived from Isonicotinic Acid Asma’u Ali Alhakim, Abubakar Mansur Ibrahim This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8946492/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 10 You are reading this latest preprint version Abstract The solvothermal reaction of isonicotinic acid (INA) with Co(II) and Mn(II) afforded isostructural coordination polymers of formula [M₂(INA)₄] (M = Co, Mn). The compounds were characterised by FT-IR spectroscopy, elemental (CHN) analysis, solubility studies, magnetic measurements, powder X-ray diffraction and single-crystal X-ray diffraction unit cell determination for the cobalt(II) complex. Infrared spectroscopic data confirmed deprotonation of the isonicotinic acid ligand and coordination through both carboxylate oxygen and pyridyl nitrogen donor atoms. The free ligand, showed absorption bands at 1695 cm⁻¹ and 1289 cm⁻¹ assigned to C = O and C–O stretching vibrations. Upon coordination, the C = N band shifted from 1580 cm⁻¹ in the free ligand to 1560 cm⁻¹ in the Co(II) complex and to 1559 cm⁻¹ in the Mn(II) analogue, with new absorptions near 500 cm⁻¹ and 400 cm⁻¹ corresponding to M–N and M–O vibrations.The coordination polymers exhibit low solubility in common solvents, consistent with their extended polymeric structures. Magnetic susceptibility measurements revealed effective magnetic moments of 5.81 BM for the manganese(II) polymer and 4.53 BM for the cobalt(II) polymer, indicative of high-spin octahedral metal centres. PXRD analysis showed the disappearance of characteristic ligand reflections and the appearance of new peaks associated with the coordination polymers, confirming the formation of new crystalline phases. Unit cell determination for the cobalt(II) compound indicated a monoclinic system with space group P2 1 , (a = 9.818 Å, b = 12.804 Å, c = 10.801 Å) consistent with a reported structure (CCDC 886304). Coordination polymers Isonicotinic acid Solvothermal DMF FT-IR Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 06 Apr, 2026 Reviews received at journal 03 Apr, 2026 Reviewers agreed at journal 03 Apr, 2026 Reviews received at journal 02 Apr, 2026 Reviewers agreed at journal 01 Apr, 2026 Reviewers invited by journal 06 Mar, 2026 Editor invited by journal 06 Mar, 2026 Editor assigned by journal 04 Mar, 2026 Submission checks completed at journal 04 Mar, 2026 First submitted to journal 23 Feb, 2026 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8946492","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":601864329,"identity":"47691f9b-ab51-47d5-8e4c-382519377264","order_by":0,"name":"Asma’u Ali Alhakim","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA+klEQVRIiWNgGAWjYFAC5jYGhgMSDPwQXgIU4wWMEC2SDSRqYWAwOECsFv72g20PfpyxiDa+kWO68WdbGgM/e44Bc8Ev3FokziS2G/bckMjddiPH7DZvWw6DZM8bA+aZfXisOZDYJsHzAaqFsa2CweAG0BbeHtw65M8/bJP8A9SyeUaO2c2fQC32hLQY3Ehsk+YBOmyDRI7ZDZDDDCSAWnh+4NZieONhm7TMGYncGWeeld3mOZfGI3HmWcFh3gbcWuTOJx+TfHOsLre/PXnbzR9lyXL87ckbH/P8weN9OBBIAFM8IOIAKLIIA/4DyDyibBkFo2AUjIIRAgCKOlmTEBJfUAAAAABJRU5ErkJggg==","orcid":"","institution":"Northwest University","correspondingAuthor":true,"prefix":"","firstName":"Asma’u","middleName":"Ali","lastName":"Alhakim","suffix":""},{"id":601864330,"identity":"d9a4881d-3c47-4f2e-86db-ac18302a8679","order_by":1,"name":"Abubakar Mansur Ibrahim","email":"","orcid":"","institution":"Yusuf Maitama Sule University of Education","correspondingAuthor":false,"prefix":"","firstName":"Abubakar","middleName":"Mansur","lastName":"Ibrahim","suffix":""}],"badges":[],"createdAt":"2026-02-23 11:24:39","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-8946492/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8946492/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":104433524,"identity":"873ed1a9-47c4-49d1-aec3-a6ca1c26e94a","added_by":"auto","created_at":"2026-03-11 16:11:09","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":523046,"visible":true,"origin":"","legend":"","description":"","filename":"SynthesisandStructuralElucidationofCo.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8946492/v1_covered_e2dcdebd-6c2f-4c36-b3e1-b1470af1d918.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Synthesis and Structural Elucidation of Co(II) and Mn(II) Coordination Polymers Derived from Isonicotinic Acid","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"discover-chemistry","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"Learn more about [Discover Chemistry](https://link.springer.com/journal/44371)","snPcode":"44371","submissionUrl":"https://submission.nature.com/new-submission/44371/3","title":"Discover Chemistry","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Discover Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true},"keywords":"Coordination polymers, Isonicotinic acid, Solvothermal, DMF, FT-IR","lastPublishedDoi":"10.21203/rs.3.rs-8946492/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8946492/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe solvothermal reaction of isonicotinic acid (INA) with Co(II) and Mn(II) afforded isostructural coordination polymers of formula [M₂(INA)₄] (M\u0026thinsp;=\u0026thinsp;Co, Mn). The compounds were characterised by FT-IR spectroscopy, elemental (CHN) analysis, solubility studies, magnetic measurements, powder X-ray diffraction and single-crystal X-ray diffraction unit cell determination for the cobalt(II) complex. Infrared spectroscopic data confirmed deprotonation of the isonicotinic acid ligand and coordination through both carboxylate oxygen and pyridyl nitrogen donor atoms. The free ligand, showed absorption bands at 1695 cm⁻\u0026sup1; and 1289 cm⁻\u0026sup1; assigned to C\u0026thinsp;=\u0026thinsp;O and C\u0026ndash;O stretching vibrations. Upon coordination, the C\u0026thinsp;=\u0026thinsp;N band shifted from 1580 cm⁻\u0026sup1; in the free ligand to 1560 cm⁻\u0026sup1; in the Co(II) complex and to 1559 cm⁻\u0026sup1; in the Mn(II) analogue, with new absorptions near 500 cm⁻\u0026sup1; and 400 cm⁻\u0026sup1; corresponding to M\u0026ndash;N and M\u0026ndash;O vibrations.The coordination polymers exhibit low solubility in common solvents, consistent with their extended polymeric structures. Magnetic susceptibility measurements revealed effective magnetic moments of 5.81 BM for the manganese(II) polymer and 4.53 BM for the cobalt(II) polymer, indicative of high-spin octahedral metal centres. PXRD analysis showed the disappearance of characteristic ligand reflections and the appearance of new peaks associated with the coordination polymers, confirming the formation of new crystalline phases. Unit cell determination for the cobalt(II) compound indicated a monoclinic system with space group P2\u003csub\u003e1\u003c/sub\u003e, (a\u0026thinsp;=\u0026thinsp;9.818 \u0026Aring;, b\u0026thinsp;=\u0026thinsp;12.804 \u0026Aring;, c\u0026thinsp;=\u0026thinsp;10.801 \u0026Aring;) consistent with a reported structure (CCDC 886304).\u003c/p\u003e","manuscriptTitle":"Synthesis and Structural Elucidation of Co(II) and Mn(II) Coordination Polymers Derived from Isonicotinic Acid","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-03-11 16:10:38","doi":"10.21203/rs.3.rs-8946492/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"decision","content":"Revision requested","date":"2026-04-06T06:33:31+00:00","index":"","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-04-03T14:32:11+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"55742743932853467227709279572718064963","date":"2026-04-03T14:07:23+00:00","index":"hide","fulltext":""},{"type":"editorInvitedReview","content":"","date":"2026-04-02T04:03:06+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"332970360398085201932354100655469262513","date":"2026-04-01T11:00:52+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2026-03-06T11:55:05+00:00","index":"","fulltext":""},{"type":"editorInvited","content":"","date":"2026-03-06T10:32:41+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-03-04T07:12:27+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2026-03-04T07:08:28+00:00","index":"","fulltext":""},{"type":"submitted","content":"Discover Chemistry","date":"2026-02-23T11:18:55+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"discover-chemistry","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":"Learn more about [Discover Chemistry](https://link.springer.com/journal/44371)","snPcode":"44371","submissionUrl":"https://submission.nature.com/new-submission/44371/3","title":"Discover Chemistry","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Discover Series","inReviewEnabled":true,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"4a1a0d49-6061-4b4d-879e-d33cc5081fe3","owner":[],"postedDate":"March 11th, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2026-05-06T10:09:23+00:00","versionOfRecord":[],"versionCreatedAt":"2026-03-11 16:10:38","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-8946492","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-8946492","identity":"rs-8946492","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}