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The three-dimensional structures of\n                    <jats:bold>1<\/jats:bold>\n                    and\n                    <jats:bold>2<\/jats:bold>\n                    are very similar, being governed by \u03bc\n                    <jats:sub>4<\/jats:sub>\n                    -\u03ba\n                    <jats:sup>1<\/jats:sup>\n                    :\u03ba\n                    <jats:sup>1<\/jats:sup>\n                    :\u03ba\n                    <jats:sup>1<\/jats:sup>\n                    :\u03ba\n                    <jats:sup>1<\/jats:sup>\n                    coordination of the pyrazolate anions as hard Lewis bases [K\u2014N = 2.783\u2005(3)\u20132.956\u2005(3); Rb\u2014N = 2.930\u2005(4)\u20133.194\u2005(4)\u2005\u00c5]. In contrast, the structure of\n                    <jats:bold>3<\/jats:bold>\n                    reveals a dominant significance for the pyrazolate\u2013\u03c0 coordination, which produces two distinct motifs in the forms of finite Cs\u2014\u03c0 arrangement [Cs\u2014ring centroid distance = 3.389\u2005(3)\u2005\u00c5] and one-dimensional \u2014Cs\u2014(\u03c0\u2014Cs)\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    \u2014 sandwiches with slightly larger Cs\u2014\u03c0 separations at 3.474\u2005(3) and 3.587\u2005(3)\u2005\u00c5. Weaker ion\u2013dipole interactions with the nitro-O donors, at the distances approaching the sums of corresponding ionic radii, are relevant for the entire series and they complete typically high coordination numbers of the metal ions [CN = 8, 9]. These findings may find use in the construction of ion-selective receptors since the existing examples for the coordinative discrimination of the late alkali metal ions, beyond the ion-cavity size match considerations, are still rare.\n                  <\/jats:p>","DOI":"10.1107\/s2056989026005037","type":"journal-article","created":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T08:26:38Z","timestamp":1779179198000},"page":"683-691","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":0,"title":["Dibasic 3,3\u2032-dinitro-4,4\u2032-bipyrazole-1,1\u2032-diides of K, Rb and Cs reveal metal-selective ring\u2013\u03c0 over ring\u2013N coordination"],"prefix":"10.1107","volume":"82","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8733-4630","authenticated-orcid":true,"given":"Kostiantyn V.","family":"Domasevitch","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02aaqv166","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vira V.","family":"Ponomarova","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02aaqv166","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2026,5,19]]},"reference":[{"key":"hb8215_bb1","doi-asserted-by":"crossref","first-page":"1051","DOI":"10.1039\/jr9650001051","author":"Austin","year":"1965","journal-title":"J. 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