Immobilized-polysiloxane ethyl amino benzoate derivatives. Synthesis, characterizations and applications Nizam M. El-Ashgar a , Issa M. El-Nahhal b, * , Mohamed M. Chehimi c , Florence Babonneau d , Jacques Livage d a Department of Chemistry, The Islamic University of Gaza, P.O. Box 108, Gaza, Palestine b Department of Chemistry, Al-Azhar University, P.O. Box 1277, Gaza, Palestine c ITODYS, Universite ´ Paris 7 – Denis Diderot, associe ´ au CNRS (UMR 7086), 1 rue Guy de la Brosse, 75005 Paris, France d Laboratoire de Chimie de la Matie `re Condense ´e, Universite ´ Paris VI, 4 place Jussieu, 75252 Paris, France Received 12 February 2004; received in revised form 6 July 2004; accepted 11 January 2005 Abstract Insoluble solid porous ethyl-2-iminobenzoate immobilized polysiloxane ligand system of the general formula P–(CH 2 ) 3 –NH(C 6 H 4 )COOC 2 H 5 , (where P represents [Si–O] n siloxane network) has been prepared by the reaction of 3-iodopolysiloxane P–(CH 2 ) 3 –I with ethyl-2-aminobenzoate. The modified polysiloxane derivatives; imino(N-2-amino- ethyl)benzamide P–(CH 2 ) 3 –NH(C 6 H 4 )CONH(CH 2 ) 2 NH 2 , and imino(N-diethylenediamine)benzamide P–(CH 2 ) 3 – NH(C 6 H 4 )CONH(CH 2 ) 2 NH(CH 2 ) 2 NH 2 ligand systems were prepared by the reaction of ethyl-2-iminobenzoate ligand system with ethylenediamine and diethylenetriamine, respectively. The new modified polysiloxane ligand systems exhibit high potential for the uptake of the metal ions (Mn 2+ , Fe 3+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ ) with an efficiency of 92–98% after recovery from its primary metal complexes. These immo- bilized-polysiloxane ligand systems undergo chemical degradation the level of which depends on pH. Ó 2005 Published by Elsevier B.V. Keywords: Metal uptake; Ethylaminobenzoate; Ethylenediamine; Diethylenetriamine polysiloxanes; Immobilized-polysiloxane ligand systems 1. Introduction Organosilane modified silica has become of great importance in science and industry, be- cause of its widespread applications. Two meth- ods are used for the preparations, modification 1381-5148/$ - see front matter Ó 2005 Published by Elsevier B.V. doi:10.1016/j.reactfunctpolym.2005.01.003 * Corresponding author. E-mail address: issaelnahal@hotmail.com (I.M. El-Nahhal). Reactive & Functional Polymers 63 (2005) 199–213 REACTIVE & FUNCTIONAL POLYMERS www.elsevier.com/locate/react