Authors
Shilpa Shajan, Devipriya Sivadasan, Krishnan Thirumoorthy, Venkatesan S Thimmakondu
Published in
Chemphyschem : a European journal of chemical physics and physical chemistry. Pages e2500455. Aug 25, 2025. Epub Aug 25, 2025.
Abstract
Here, four stationary points with a planar tetracoordinate carbon (ptC) atom that are considered as anti-van't Hoff Le Bel molecules have been computationally identified for the first time within C6NH elemental composition. In total, 99 stationary points of C6NH ranging from 0.00 to 186.95 kcal mol-1 are theoretically identified using density functional theory at the B3LYP-D3BJ/cc-pVTZ level of theory. Low-lying isomers and ptC isomers that are local minima are further investigated with coupled-cluster calculations at the CCSD(T)/cc-pVTZ level of theory. These include the linear triplet isomer, HC6N, 1-cyanopenta-1,2-dien-4-yn-1,3-diyl (1) and the ring-chain carbene, 2-(2-cyanoeth-1-ynyl)cycloprop-2-en-1-ylidene (2). Both 1 and 2 are polar with dipole moment values of 4.86 and 3.56 Debye, respectively, and are experimentally known molecules through Fourier transform microwave spectroscopy. The current theoretical study reveals that two of these ptC isomers (ptC25 and ptC29) upon ring-opening pathways of CC single bonds connected to the ptC atom lead to the formation of experimentally known cyano ring-chain carbene, 2 and another polar (μ = 4.18 Debye) low-lying ring-chain carbene, 2-cyano-3-ethynylcycloprop-2-en-1-ylidene (5), which is yet to be identified in the laboratory. Formation of both 2 and 5 from the ptC isomers are found to be highly exothermic in nature.
PMID:
40853635
Bibliographic data and abstract were imported from PubMed on 25 Aug 2025.
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