Table of Contents
Journal of Solid State Physics
Volume 2013, Article ID 363209, 10 pages
http://dx.doi.org/10.1155/2013/363209
Research Article

Study of Materials for Drugs Delivery: cis-[PtCl2(NH3)2] Hydrolysis on Functionalized SiO2(100) Surfaces

1Universidad Nacional del Sur, IFISUR, CONICET, Avenida Alem 1253, 8000 Bahía Blanca, Argentina
2Universidad Tecnológica Nacional, 11 de Abril 461, 8000 Bahía Blanca, Argentina

Received 17 August 2013; Revised 27 October 2013; Accepted 19 November 2013

Academic Editor: Shi J. Xu

Copyright © 2013 A. Díaz Compañy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The hydrolysis of the cis-platin drug on a SiO2(100) hydrated surface was investigated by computational modeling. The cisplatin molecule presents weak interactions with the neighbouring OH groups of the hydrated surface. The cisplatin hydrolysis is not favourable on the SiO2(100) surface. Consequently, the adsorption properties of SiO2(100) are improved considering the surface's modification with K, Mg, or NH2 functional species. In general, the system is more stable and the molecule-surface distance is reduced when cisplatin is adsorbed on the promoted surfaces. The hydrolysis is a favourable process on the SiO2(100) functionalized surfaces. The cisplatin hydrolysis is most favoured when the surface is functionalized with the NH2 specie. The electron density exchange plays a main role in the adsorption process. cis-[PtCl2(NH3)2] and cis-[PtCl(NH3)2]+ are adsorbed on the functionalized surface via Cl–N and Cl–Si interactions, while the cis-[Pt(NH3)2]2+ complex is adsorbed through Pt–O, Pt–Si, and Pt–H interactions. After adsorption, the strength of the N–Si, Si–O, and N–H superficial bonds of the functionalized SiO2(100) changes favouring the interaction between the molecule and their complexes with the surface.