title: Exploring the effect of surface functionality on the self-assembly of polyoxopalladate macroions.
abstract: The solution behavior of the two polyoxo-13-palladates(II) ([Pd(II) 13 As(V) 8 O34 (OH)6 ](8-) and [Pd(II) 13 (As(V) Ph)8 O32 ](6-) ) was studied in detail. We discovered that the countercation-mediated attraction is the driving force for their self-assembly into larger architectures. However, the presence of phenyl groups in the periphery of [Pd(II) 13 (As(V) Ph)8 O32 ](6-) results in an enhanced attraction among these polyanions through hydrophobic interactions, which leads to completely different trends of assembly size for these two very similar clusters when decreasing solvent polarity. An increase of assembly size with increasing solvent polarity was observed for [Pd(II) 13 (As(V) Ph)8 O32 ](6-) , whereas for [Pd(II) 13 As (V) 8 O34 (OH)6 ](8-) it was the opposite, due to the absence of hydrophobic interactions.
authors.affiliation: Department of Polymer Science, The University of Akron, Akron, OH. 44325-3909 (USA) http://gozips.uakron.edu/∼tliu/
authors.forename: Fadi
authors.initials: F
authors.lastname: Haso
authors.affiliation: Department of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen (Germany).
authors.forename: Peng
authors.initials: P
authors.lastname: Yang
authors.affiliation: Department of Polymer Science, The University of Akron, Akron, OH. 44325-3909 (USA) http://gozips.uakron.edu/∼tliu/
authors.forename: Yunyi
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Polymer Science, The University of Akron, Akron, OH. 44325-3909 (USA) http://gozips.uakron.edu/∼tliu/
authors.forename: Panchao
authors.initials: P
authors.lastname: Yin
authors.affiliation: Department of Polymer Science, The University of Akron, Akron, OH. 44325-3909 (USA) http://gozips.uakron.edu/∼tliu/
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, 60439 (USA).
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: Department of Life Sciences and Chemistry, Jacobs University, P.O. Box 750 561, 28725 Bremen (Germany). u.kortz@jacobs-university.de.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Kortz
authors.affiliation: Department of Polymer Science, The University of Akron, Akron, OH. 44325-3909 (USA) http://gozips.uakron.edu/∼tliu/. tliu@uakron.edu.
authors.forename: Tianbo
authors.initials: T
authors.lastname: Liu
keywords: blackberry; palladium; polyanions; polyoxometalates; self-assembly