Abstract
Phosphate diesters are well known to form intermolecular H-bonded dimeric structures in their solid-state. Recently, we reported 2,6-(CHPh)2-4-iPr-phenyl substituted phosphate diester exists as H-bonded monomeric molecular structure along with water dimer in the solid-state. Herein we report 2,6-(CHPh)2-4-iPr-phenyl substituted phosphate diester forms a monomeric molecular structure in the solid-state upon co-crystallization with dimethylformamide, DMF (Me2NCHO). The -CHO group of DMF simultaneously acts as an H-bond acceptor to P-OH and an H-bond donor to P=O moieties. We also used the alcohols, ROH (R = Me, Et, iPr, and tBu), for crystallisation of 2,6-(CHPh)2-4-iPr-phenyl substituted phosphate diester. In these instances, solvent-incorporated dimeric structures are found in the solid-state. We also report the syntheses and molecular structures of anionic phosphate diesters of 2,6-(CHPh)2-4-iPr-phenyl substituted phosphate diester possessing various counter cations. Moreover, we also report the syntheses and molecular structures of phosphate diesters based on (−)-menthol, (+)-menthol and (+)/(−)-menthol. These exist as H-bonded dimers in the solid-state.
Graphic abstract
Herein we report 2,6-(CHPh)2-4-iPr-phenyl substituted phosphate diester forms a monomeric molecular structure in the solid-state upon co-crystallization with dimethylformamide, DMF (Me2NCHO). The -CHO group of DMF simultaneously acts as an H-bond acceptor to P-OH and an H-bond donor to P=O moieties.
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Acknowledgements
This work is supported by the TIFR Centre for Interdisciplinary Science Hyderabad, Hyderabad, India. V. G. acknowledges financial support from the Science and Engineering Research Board (SERB-NPDF) (Project No. PDF/2017/001902), Government of India. VC is thankful to the Department of Science and Technology, New Delhi, India, for National J. C. Bose fellowships.
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Mandal, D., Gupta, V., Santra, B. et al. Solvent-assisted monomeric molecular structure of the phosphate diester and the synthesis of menthol-based phosphate diesters. J Chem Sci 131, 121 (2019). https://doi.org/10.1007/s12039-019-1712-8
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DOI: https://doi.org/10.1007/s12039-019-1712-8