spectroscopic characteristics of highly selective manganese catalysis in acqueous polyurethane systems光谱特征的高选择性锰催化acqueous聚氨酯系统.pdf

Sensors 2006, 6, 1708-1720 sensors ISSN 1424-8220 © 2006 by MDPI /sensors Full Paper Spectroscopic Characteristics of Highly Selective Manganese Catalysis in Acqueous Polyurethane Systems Suzana Cakic 1, Caslav Lacnjevac 2,*, Goran Nikolic 1, Jakov Stamenkovic 1, Milos B. Rajkovic 2, 3 2 Miladin Gligoric and Miroljub Barac 1 Faculty of Technology, 16000 Leskovac, Bul. oslobodenja 124, Serbia; E-mails: suzana_cakic@ (Suzana Cakic), goranchem_yu@ (Goran Nikolić), jakov.stamenkovic@le.sbb.co.yu (Jakov Stamenkovic) 2 Faculty of Agriculture, 11080 Belgrade-Zemun, St. Nemanjina 6, Serbia; E-mails: ukilaki@eunet.yu (Caslav Lacnjevac), rajmi@agrifaculty.bg.ac.yu (Milos B. Rajkovic), baracm@agrifaculty.bg.ac.yu (Miroljub Barac) 3 Faculty of Technology, 56000 Zvornik, Karakaj bb, Srpska Republic, E-mail: lcaja@agrifaculty.bg.ac.yu (Miladin Gligoric) *Author to whom correspondence should be addressed; E-mail: lcaja@agrifaculty.bg.ac.yu or ukilaki@eunet.yu Received: 25 September 2006 / Accepted: 12 November 2006 / Published: 20 November 2006 Abstract: The latest investigations on producing more efficient catalytic aqueous polyurethane systems are in the domain of metal complexes with mixed ligands. In our previous research works, the high selectivity for the isocyanate-hydroxyl reaction in aqueous polyurethane systems has been shown by the manganese(III) mixed-ligand complexes. The two new complexes hav