Abstract
Crystals of 7,11-bis(2,4-dichlorophenyl)-2,4-dimethyl-2,4-diazaspiro[5.5]undecane -1,3,5,9-tetraone were grown in polar solvents and subjected to single crystal X-ray diffraction. The molecular crystal is Triclinic, P-1, a= 8.3734 (19) Å, b= 12.382 (3) Å, c= 12.871 (3) Å, α= 66.639 (7) ∘, β= 85.148 (7) ∘, γ= 70.690 (6) ∘, V= 1154.5 (5)Å 3, Z= 2, D calc= 1.519 g cm −3. The optimized molecular structure of the studied compound using B3LYP/6-311G(d,p) method showed good agreement with the X-ray structure. The electronic and spectroscopic properties of the title compound were predicted. The NBO calculations were used to calculate the natural atomic charges at the different atomic sites as well as the intramolecular charge transfer (ICT) interactions among the most significant natural orbitals. The high LP(N) → BD*(2)C-O ICT interaction energies indicate strong electron delocalization from the lone pair of the N-atoms of the pyrimidinetrione ring to the adjacent carbonyl groups. In contrast, the small LP(O) →BD*(1)C-H stabilization energies (E (2)) indicated weak C-H—O interactions. Experimentally, the studied compound showed the most intense electronic transition band at 232 nm which is calculated using TD-DFT method as a shoulder at 231.3 nm (f =0.0832) and it belongs to H-3/H-1 →L+1 and H-2 →L+2 excitations. The GIAO calculated 1H and 13C NMR chemical shifts showed good correlations with the experimental data.
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The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding this Research group NO (RG -044-1435-1436).
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All additional information pertaining to characterization of the target compound: The correlation graphs between calculated and observed geometrical parameters of the title compound are shown in figure S1 S1. NMR (figures S2 and S3), IR (figure S4), H-bonding information (table S1) and NMR chemical shift data (table S2) are given in the Supplementary Information which is available at www.ias.ac.in/chemsci.
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ISLAM, M.S., BARAKAT, A., AL-MAJID, A.M. et al. Crystal Structure of 7,11-bis(2,4-dichlorophenyl)-2,4-dimethyl-2,4- diazaspiro[5.5]undecane -1,3,5,9-tetraone and its computational studies. J Chem Sci 127, 2039–2050 (2015). https://doi.org/10.1007/s12039-015-0969-9
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DOI: https://doi.org/10.1007/s12039-015-0969-9