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Herein, we report the network structures of the missing pieces of carboxyphenylbenzene (CPB) derivatives, the simplest series of building blocks for hydrogen\u2010bonded organic frameworks (HOFs), and elucidate their network topology in a crystalline state. 1,2,3,5\u2010Tetrakis\u2010 and 1,2,3,4,5\u2010pentakisCPBs (\n                    <jats:bold>1235CPB<\/jats:bold>\n                    and\n                    <jats:bold>12345CPB<\/jats:bold>\n                    ) form H\u2010bonded networks with\n                    <jats:bold>\n                      <jats:italic>sql<\/jats:italic>\n                    <\/jats:bold>\n                    \u2010 and\n                    <jats:bold>\n                      <jats:italic>cem<\/jats:italic>\n                    <\/jats:bold>\n                    \u2010topologies, respectively. Furthermore, it is remarkable that\n                    <jats:bold>1235CPB<\/jats:bold>\n                    forms a more complicated\n                    <jats:bold>\n                      <jats:italic>cqe<\/jats:italic>\n                    <\/jats:bold>\n                    \u2010topological network structure with three kinds of voids in crystalline states under the same crystallization condition, although the formation occurs infrequently. The network structure with\n                    <jats:bold>\n                      <jats:italic>cqe<\/jats:italic>\n                    <\/jats:bold>\n                    \u2010topology is hitherto unknown in molecule\u2010based framework materials. Other molecules in the series of CPB gave no H\u2010bonded network with complicated topology, enabling us to estimate the limitation for generating entropically unfavorable networks on the basis of a simple consideration of the number of cases for the network formation. We also report thermal behaviors, porosity, and structural transformation of these H\u2010bonded network crystals from a materials perspective.\n                  <\/jats:p>","DOI":"10.1002\/smll.73250","type":"journal-article","created":{"date-parts":[[2026,3,29]],"date-time":"2026-03-29T16:50:34Z","timestamp":1774803034000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Can Entropically Unfavorable Topological Hydrogen\u2010Bonded Networks Form From Tetrakis\u2010 or Pentakis(4\u2010Carboxyphenyl)benzene Derivative?"],"prefix":"10.1002","volume":"22","author":[{"given":"Rento","family":"Maeda","sequence":"first","affiliation":[{"name":"Division of Chemistry Graduate School of Engineering Science The University of Osaka  Toyonaka Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryusei","family":"Oketani","sequence":"additional","affiliation":[{"name":"Division of Chemistry Graduate 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