[1] Univ Toulouse 3, Lab Heterochim Fdn & Appl, CNRS,UMR 5069, Equipe Ligands Bifonctionnels & Polymeres Biodegr, F-31062 Toulouse 9, France
[2] Univ Toulouse 3, INSA, Lab Phys & Chim Nanoobjets, UMR 5215, F-31077 Toulouse, France
[3] Univ Toulouse 3, FR 2599, F-31062 Toulouse 9, France