The theoretical study of bisphosphonate derivatives as drug for inhibition of cancer

DFT computations were carried out to characterize the ¹⁷Oand ²H electric field gradient, EFG, in various bisphosphonic acids derivatives. The computations were performed at the B3LYP level with 6-311++G (d, P) standard basis set. Calculated EFG tensors were used to determine the ¹⁷O and ²H nuclear quadrupole coupling constant, c and asymmetry parameter, η. The results showed that various substituents have a strong effect on the Nuclear Quadrupole Resonance (NQR) parameters (c, η) of ¹⁷O in contrast with ²H NQR parameters. The NQR parameters were studied in order to find the correlation between electronic structure and activity of structure. Investigations showed that substitutions on the carbon atom in P-C-P are important in bisphosphonates drug properties.