New highly ordered hydrophobic siloxane-based coordination polymers

Two H-bond polymers from carboxypropyl disubstituted disiloxane and bipyridyl compounds, as well as the starting components in different ratios were reacted with zinc acetate. Two new siloxane-containing coordination polymers were thus obtained and characterized. They exhibited highly ordered structures, which were investigated by single crystal XRD. One of the H-bond polymers, as well as a third coordination polymer, without the siloxane component (obtained as secondary product) were also structurally characterized. The siloxane coordination polymer obtained with 4,4'-bipyridyl has a 2D MOF structure. The homologous polymer derived from 1,2-(4-bipyridyl)ethylene forms undulated 2D-layers which are packed in the crystal leading to partial interpenetration with formation of two types of channels along crystallographic axis c. The new siloxane-containing coordination polymers were investigated by FT-IR, DSC-TG-TGA, DVS and static contact angle measurements. They are hydrophobic (by contact angle) and even superhydrophobic effect was observed on bulk powder for one of them. The solvent sorption capacity was measured by tensiometry. They were tested for catalytic activity in H2O2 decomposition and preliminary experiments for oxidation of glucose and viscose were done. (C) 2013 Elsevier Ltd. All rights reserved.