Abstract
A new polymorph of the β-modification of N,N′-di(pyridin-2-yl)formamidine that is more thermodynamically stable than the known α-modification is obtained. The crystal of β-modification contains hydrogen bonded molecular dimers with a skewed geometry. Therefore, the space group is not centrosymmetric – P42. This geometry is a result of the molecular E-syn,syn conformation in crystals of the β-phase, which differs from the E-anti,syn conformation in the α-phase. The number of crystallographically non-equivalent molecules (8) in the β-modification is unusually large for organic compounds. The structure of the packing is analyzed, and it is shown that the centers of dimers follow the sites of a distorted body-centered cubic pseudo-lattice (Ат ≈ 10 Å, αт = 90°) with a 16 times decreased unit cell volume. Reasons for symmetry violations causing modulations are considered.
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Russian Text © The Author(s), 2021, published in Zhurnal Strukturnoi Khimii, 2021, Vol. 62, No. 6, pp. 1035-1042.https://doi.org/10.26902/JSC_id74448
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Sukhikh, T.S., Kolybalov, D.S., Bashirov, D.A. et al. CONFORMATIONAL DUALISM OF DIPYRIDYL-SUBSTITUTED FORMAMIDINE. J Struct Chem 62, 966–973 (2021). https://doi.org/10.1134/S0022476621060160
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DOI: https://doi.org/10.1134/S0022476621060160