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Phosphonates are also a class of compounds with diverse applications, ranging from medicinal to material applications. Here we present the synthesis of 1\n                    <jats:italic>H<\/jats:italic>\n                    \u2010 and 2\n                    <jats:italic>H<\/jats:italic>\n                    \u2010indazolephosphonic acid derivatives substituted at C\u20103, involving mono\u2010 or bisphosphonic acids, from their corresponding carboxylic acid and esters. These compounds were fully characterized, and their spectroscopic data were evaluated to identify and distinguish the structural scaffold of each phosphonic acid. Crystallization of [hydroxy(1\u2010methyl\u20101\n                    <jats:italic>H<\/jats:italic>\n                    \u2010indazol\u20103\u2010yl)methanediyl]bis(phosphonic acid)\n                    <jats:bold>7<\/jats:bold>\n                    afforded crystals suitable for single crystal X\u2010ray diffraction studies and its crystal structure details are also discussed.\n                  <\/jats:p>","DOI":"10.1002\/slct.202102538","type":"journal-article","created":{"date-parts":[[2021,9,27]],"date-time":"2021-09-27T08:22:45Z","timestamp":1632730965000},"page":"9599-9607","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["New C\u20103 Substituted 1\n                    <i>H<\/i>\n                    \u2010 and 2\n                    <i>H<\/i>\n                    \u2010Indazolephosphonic Acid Regioisomers: Synthesis, Spectroscopic Characterization and X\u2010Ray Diffraction Studies"],"prefix":"10.1002","volume":"6","author":[{"given":"F\u00e1tima C.","family":"Teixeira","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio Nacional de Energia e Geologia, I.P. 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