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During this reaction, the formation of solid phases was detected alongside gaseous phases, resulting in a range of products with cluster cores of varying shapes. After several niobium oxyiodide cluster compounds have already been identified within this reaction system, two additional compounds, Nb6O3I15 and Nb11O6I24, are discovered and structurally characterized by single-crystal X-ray diffraction. Both structures are based on the butterfly-shaped, oxygen-capped niobium cluster [Nb4O], which is extended to larger cluster fragments. The [Nb4O] cluster core in Nb6O3I15 is extended by two [NbO] units to form a three-dimensional framework, and Nb11O6I24 contains two connected [Nb4O] units, which form chiral units within an antiferrochiral hexagonal packing of strings. The striking string-like character of Nb11O6I24 was investigated in terms of its electronic structure and properties. DFT calculations showed Nb11O6I24 to possess a zero indirect band gap, with a pair of 3-dimensional flat bands surrounding the Fermi level. These unusual features of the electronic band structure suggest the presence of strongly correlated intercluster singlet electron states, arising from the helical shape of the clusters, the hexagonal packing of the strings, and the delocalized nature of cluster electron wave functions.<\/jats:p>","DOI":"10.1021\/jacs.6c03891","type":"journal-article","created":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T16:01:58Z","timestamp":1784217718000},"page":"30861-30872","source":"Crossref","is-referenced-by-count":0,"title":["Zero\nIndirect Band Gap and Flat Bands in a Niobium\nOxyiodide Cluster Material"],"prefix":"10.1021","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-5629-2018","authenticated-orcid":true,"given":"Jan","family":"Beitlberger","sequence":"first","affiliation":[{"name":"Institute of Inorganic Chemistry , , Auf der Morgenstelle 18 , ,","place":["Tu\u0308bingen, Germany, 72076"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-4021-6615","authenticated-orcid":true,"given":"Mario","family":"Martin","sequence":"additional","affiliation":[{"name":"Eberhard Karls Universita\u0308t Tu\u0308bingen , , Auf der Morgenstelle 18 , ,","place":["Tu\u0308bingen, Germany, 72076"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2704-3591","authenticated-orcid":true,"given":"Marcus","family":"Scheele","sequence":"additional","affiliation":[{"name":"Eberhard Karls Universita\u0308t Tu\u0308bingen , , Auf der Morgenstelle 18 , ,","place":["Tu\u0308bingen, Germany, 72076"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8250-8187","authenticated-orcid":true,"given":"Marek","family":"Matas","sequence":"additional","affiliation":[{"name":"Czech Technical University in Prague , , ,","place":["Prague, Czech Republic, 115 19"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5519-2519","authenticated-orcid":true,"given":"Carl P.","family":"Romao","sequence":"additional","affiliation":[{"name":"Czech Technical University in Prague , , ,","place":["Prague, Czech Republic, 115 19"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5147-5677","authenticated-orcid":true,"given":"Markus","family":"Stro\u0308bele","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry , , Auf der Morgenstelle 18 , ,","place":["Tu\u0308bingen, Germany, 72076"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2450-4011","authenticated-orcid":true,"given":"H.-Ju\u0308rgen","family":"Meyer","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry , , Auf der Morgenstelle 18 , ,","place":["Tu\u0308bingen, Germany, 72076"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,16]]},"reference":[{"issue":"24","key":"2026073021325799400_cit1","doi-asserted-by":"publisher","first-page":"16729","DOI":"10.1021\/jacs.4c04294","article-title":"Carborane-Cluster-Wrapped Copper\nCluster with Cyclodextrin-like\nCavities for Chiral Recognition","volume":"146","author":"Huang","year":"2024","journal-title":"J. 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