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Solvent effect on molecular structure, IR spectra, thermodynamic properties and chemical stability of zoledronic acid: DFT study

  • Qingzhu Liu
  • Ling QiuEmail author
  • Yang Wang
  • Gaochao Lv
  • Guiqing Liu
  • Shanshan Wang
  • Jianguo LinEmail author
Original Paper

Abstract

Zoledronic acid (ZL) has been used widely for treating skeletal diseases because of its high potency in inhibiting bone resorption. A detailed understanding of its physicochemical characteristics may be of great significance in both medicinal chemistry and structural biology for the design of novel bisphosphonates with higher activity. In the present work, the monoclinic (IM) and triclinic (IT) polymorphs of ZL in the gas phase and the aqueous phase were studied by density functional theory (DFT) method at the B3LYP/6-311++G** level. The polarizable continuum model (PCM) was employed to study the solvent effect on structures and properties. The optimized IM and IT conformations in both phases are in reasonable agreement with the experimental structures with the overall mean absolute percent deviation (MAPD%) less than 3.1 %. The presence of intramolecular hydrogen bond within both conformations was identified in the solvent. The IR spectra were simulated and assigned in detail, which agreed well with the experimental data. The intramolecular hydrogen bonding interactions resulted in the shift of vibrational frequencies of hydroxyl to the low band by 12–22 cm−1 and 24–26 cm−1 for IM and IT conformations, respectively. Their thermodynamic properties were also calculated based on the harmonic vibrational analysis, including standard heat capacity (C ° p,m), entropy (S ° m), and enthalpy (H ° m). The molecular stability, hydrogen bonding interaction and other electronic properties have been further analyzed by the natural bond orbital (NBO), atoms in molecules (AIM), molecular electrostatic potential (MEP) and frontier molecular orbital (FMO) analysis.

Graphical abstract

FMOs of IM and IT conformations in the gas phase and in the water.

Keywords

Zoledronic acid DFT Solvent effect Hydrogen bonding Chemical stability 

Notes

Acknowledgments

This work was financially supported by National Natural Science Foundation of China (21371082, 21501074), Natural Science Foundation of Jiangsu Province (BK20141102, BK20151118), and Key Medical Talent Project of Jiangsu Province (RC2011097).

Supplementary material

894_2016_2953_MOESM1_ESM.docx (23 kb)
Table S1 (DOCX 23 kb)
894_2016_2953_MOESM2_ESM.docx (21 kb)
Table S2 (DOCX 20 kb)
894_2016_2953_MOESM3_ESM.docx (19 kb)
Table S3 (DOCX 18 kb)
894_2016_2953_MOESM4_ESM.docx (430 kb)
Fig. S1 (DOCX 429 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Key Laboratory of Nuclear Medicine, Ministry of Health & Jiangsu Key Laboratory of Molecular Nuclear MedicineJiangsu Institute of Nuclear MedicineWuxiPeople’s Republic of China

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