title: Large polyoxotitanate clusters: well-defined models for pure-phase TiO2 structures and surfaces.
abstract: Careful control of the temperature and duration of the reaction between titanium tert-butoxide and acetic acid leads to the formation of new polyoxotitanate clusters with 14, 18, and 28 Ti atoms. They are considered intermediates in the growth of Ti/O nanoclusters of increasing size. The Ti(28) cluster is the largest crystallized to date. UV/vis spectroscopy on this cluster reveals that the optical band gap is blue-shifted with respect to a cluster containing only 17 titanium atoms indicating that the optical properties are more heavily influenced by the internal structure of the particle than its size.
authors.affiliation: Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14216, USA. jbb6@buffalo.edu
authors.forename: Jason B
authors.initials: JB
authors.lastname: Benedict
authors.forename: Renata
authors.initials: R
authors.lastname: Freindorf
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Trzop
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Cogswell
authors.forename: Philip
authors.initials: P
authors.lastname: Coppens
mesh_terms: D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D011108:Polymers; C009495:titanium dioxide; D014025:Titanium