Abstract
The crystal and molecular structure of ( + )-(S,S′ )-α,α′-(9-oxo-1,5-diphenyl-3,7-diazabicyclo[3.3.]]non-3,7-ylene)diprvpionic acid (I) was determined by X-ray diffraction: space group P21]2121, a = 11.277(1), b = 17.810(2), c = 21.865(2) Å, Z = 8(C25H28N2O5)-The structure of 1 was solved by direct methods and refined by the full-matrix least-squares procedure in an anisotropic approximation to R = 0.044 for 3655 independent reflections (CAD-4 automatic diffractometer, λCuKα. The structure contains two symmetrically independent molecules existing in zwitterionic form (with one pmtonated N atom) and having similar geometrical parameters of the bicyclic frameworks and different orientations (conformations) of their acid substituents. In both molecules, the bicyclic framework consists of two fused six-membered rings and has a chair-chair conformation stabilized by the intramolecular H-bond N-H...N. The carboxyl H atoms of both independent molecules are involved in strong intermolecular H-bonds O-H...O, some of which are nearly symmetrical
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Translated from Zhumal Struktumoi Khimii, Vol. 41, No. 1, pp. 140-148, January–February, 2000.
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Chekhlov, A.N. Crystal and molecular structure of (+ )-(S,S′)-α,α′-(9-OXO-1,5-diphenyl-3,7-diazabicyclo[3.3.1]non-3,7-ylene)dipropionic acid. J Struct Chem 41, 116–122 (2000). https://doi.org/10.1007/BF02684736
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DOI: https://doi.org/10.1007/BF02684736