PMID- 37686131 OWN - NLM STAT- MEDLINE DCOM- 20230911 LR - 20230911 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 24 IP - 17 DP - 2023 Aug 28 TI - Halogen Bonding Involving Isomeric Isocyanide/Nitrile Groups. LID - 10.3390/ijms241713324 [doi] LID - 13324 AB - 2,3,5,6-Tetramethyl-1,4-diisocyanobenzene (1), 1,4-diisocyanobenzene (2), and 1,4-dicyanobenzene (3) were co-crystallized with 1,3,5-triiodotrifluorobenzene (1,3,5-FIB) to give three cocrystals, 1.1,3,5-FIB, 2.2(1,3,5-FIB), and 3.2(1,3,5-FIB), which were studied by X-ray diffraction. A common feature of the three structures is the presence of I...C(isocyanide) or I...N(nitrile) halogen bonds (HaBs), which occurs between an iodine sigma-hole and the isocyanide C-(or the nitrile N-) atom. The diisocyanide and dinitrile cocrystals 2.2(1,3,5-FIB) and 3.2(1,3,5-FIB) are isostructural, thus providing a basis for accurate comparison of the two types of noncovalent linkages of C identical withN/N identical withC groups in the composition of structurally similar entities and in one crystal environment. The bonding situation was studied by a set of theoretical methods. Diisocyanides are more nucleophilic than the dinitrile and they exhibit stronger binding to 1,3,5-FIB. In all structures, the HaBs are mostly determined by the electrostatic interactions, but the dispersion and induction components also provide a noticeable contribution and make the HaBs attractive. Charge transfer has a small contribution (<5%) to the HaB and it is higher for the diisocyanide than for the dinitrile systems. At the same time, diisocyanide and dinitrile structures exhibit typical electron-donor and pi-acceptor properties in relation to the HaB donor. FAU - Smirnov, Andrey S AU - Smirnov AS AD - Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia. FAU - Katlenok, Eugene A AU - Katlenok EA AUID- ORCID: 0000-0002-4485-7247 AD - Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia. FAU - Mikherdov, Alexander S AU - Mikherdov AS AUID- ORCID: 0000-0002-6471-5158 AD - Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia. FAU - Kryukova, Mariya A AU - Kryukova MA AD - Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia. FAU - Bokach, Nadezhda A AU - Bokach NA AUID- ORCID: 0000-0001-8692-9627 AD - Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia. FAU - Kukushkin, Vadim Yu AU - Kukushkin VY AUID- ORCID: 0000-0002-2253-085X AD - Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia. AD - Laboratory of Crystal Engineering of Functional Materials, South Ural State University, 76, Lenin Av., 454080 Chelyabinsk, Russia. LA - eng GR - 22-23-00307/Russian Science Foundation/ PT - Journal Article DEP - 20230828 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0 (1,4-diisocyanobenzene) RN - 0 (Cyanides) RN - 0 (Halogens) RN - 0 (Nitriles) RN - 9679TC07X4 (Iodine) SB - IM MH - *Cyanides MH - Halogens MH - Nitriles MH - *Iodine PMC - PMC10487382 OTO - NOTNLM OT - NBO analysis OT - QTAIM OT - SAPT OT - halogen bond OT - isocyanides OT - nitriles COIS- The authors declare no conflict of interest. EDAT- 2023/09/09 11:45 MHDA- 2023/09/11 06:42 PMCR- 2023/08/28 CRDT- 2023/09/09 01:12 PHST- 2023/07/26 00:00 [received] PHST- 2023/08/24 00:00 [revised] PHST- 2023/08/25 00:00 [accepted] PHST- 2023/09/11 06:42 [medline] PHST- 2023/09/09 11:45 [pubmed] PHST- 2023/09/09 01:12 [entrez] PHST- 2023/08/28 00:00 [pmc-release] AID - ijms241713324 [pii] AID - ijms-24-13324 [pii] AID - 10.3390/ijms241713324 [doi] PST - epublish SO - Int J Mol Sci. 2023 Aug 28;24(17):13324. doi: 10.3390/ijms241713324.