title: Interaction of TiO2(-) with water: photoelectron spectroscopy and density functional calculations.
abstract: The interactions of titania with water molecules were studied via photoelectron spectroscopy and density functional calculations of TiO(OH)2(-) and Ti(OH)4(H2O)n(-) (n = 0-5) clusters which are corresponding to the TiO2(H2O)(-) and TiO2(H2O)n+2(-) (n = 0-5) systems, respectively. Experimental observation and theoretical calculations confirmed that TiO(OH)2(-) was produced when TiO2(-) interacts with one water molecule, and Ti(OH)4(H2O)n(-) (n = 0-5) were produced successively when TiO2(-) interacts with two or more water molecules. The structures of Ti(OH)4(H2O)n(-) with n = 4, 5 are slightly different from those of n = 1-3. The structures of Ti(OH)4(H2O)1-3(-) can be viewed as the water molecules interacting with the Ti(OH)4(-) core through hydrogen bonds; however, in Ti(OH)4(H2O)4,5(-), one of the water molecules interacts directly with the Ti atom via its oxygen atom instead of a hydrogen bond and distorted the Ti(OH)4(-) core.
authors: College of Electronics and Information, Xi'an Polytechnic University, Xi'an 710048, China.
authors: Ren-Zhong
authors: RZ
authors: Li
authors: Hong-Guang
authors: HG
authors: Xu
authors: Guo-Jin
authors: GJ
authors: Cao
authors: Xi-Ling
authors: XL
authors: Xu
authors: Wei-Jun
authors: WJ
authors: Zheng