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Two structures were selected for which QTAIM, NCI and NBO analyses suggested an attractive interaction. However, the calculated interaction energy was negative for only one of these systems. The ability of methyl groups to interact with one another is then examined by DFT calculations. A series of (CH<jats:sub>3<\/jats:sub>PnHCH<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub> homodimers were allowed to interact with each other for a range of Pn atoms N, P, As, and Sb. Interaction energies of these C\u22c5\u22c5\u22c5C tetrel\u2010bonded species were below 1\u2005kcal\/mol, but could be raised to nearly 3\u2005kcal\/mol if the C atom was changed to a heavier tetrel. A strengthening of the C\u22c5\u22c5\u22c5C intermethyl bonds can also be achieved by introducing an asymmetry via an electron\u2010withdrawing substituent on one unit and a donor on the other. The attractions between the methyl and related groups occur in spite of a coulombic repulsion between \u03c3\u2010holes on the two groups. NBO, AIM, and NCI tools must be interpreted with caution as they can falsely suggest bonding when the potentials are repulsive.<\/jats:p>","DOI":"10.1002\/cphc.202400495","type":"journal-article","created":{"date-parts":[[2024,10,1]],"date-time":"2024-10-01T06:04:42Z","timestamp":1727762682000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Attraction versus Repulsion between Methyl and Related Groups: (CH<sub>3<\/sub>NHCH<sub>3<\/sub>)<sub>2<\/sub> and (CH<sub>3<\/sub>SeBr<sub>2<\/sub>CH<sub>3<\/sub>)<sub>2<\/sub>"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6495-6963","authenticated-orcid":false,"given":"Mariusz","family":"Michalczyk","sequence":"first","affiliation":[{"name":"Faculty of Chemistry Wroc\u0142aw University of Science and Technology  Wybrze\u017ce Wyspia\u0144skiego 27 50-370 Wroc\u0142aw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0793-0369","authenticated-orcid":false,"given":"Steve","family":"Scheiner","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry Utah State University Logan  Utah 84322-0300 United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4038-5959","authenticated-orcid":false,"given":"Wiktor","family":"Zierkiewicz","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry Wroc\u0142aw University of Science and Technology  Wybrze\u017ce Wyspia\u0144skiego 27 50-370 Wroc\u0142aw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,11,8]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"\u00a0"},{"key":"e_1_2_8_2_2","doi-asserted-by":"publisher","DOI":"10.1093\/oso\/9780195090116.001.0001"},{"key":"e_1_2_8_3_2","volume-title":"An Introduction to Hydrogen Bonding, Vol. 12","author":"Jeffrey G. 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