Inorganic-organic hybrid materials based on metal organophosphonates
Provider: Grantová agentura ČR
Programme: Standardní projekty
Implementation period: 01.01.08 - 31.12.12
Workplace:
Fakulta chemicko-technologická - Ústav organické chemie a technologie
Investigator: Pytela Oldřich
Description:
Preparation and characterization of new metal phosphonates suitable as: (1) hosts in intercalation reactions. The material should have a layered structure and should be equipped with functional groups able to interact with guest molecules. Other possibility is a use of such metals (e.g. vanadium or copper) which form phosphonates with a metal coordination site available for coordinative intercalation of guest molecules having character of Lewis bases. (2) ion exchangers. Again, suitable functional groups (acidic, i.e., carboxyl or sulfo groups or basic, like an amino group) should be attached to the organic moiety. (3) materials for molecular recognition. The structure of the organic part of the phosphonate is important in this case. We focus our attention to chiral ligands especially those derived from substituted imidazole. A possible catalytic application is also considered for these materials. (4) materials with enhanced proton conductivity. Despite a suitable functional group, the stability of such materials is also important, that is their resistance against increased acidity, humidity and temperature. For such purpose, phosphonates of tetravalent metals such as zirconium or titanium seems to be the most suitable as they are stable at pH below 2. The properties of the prepared compounds relevant for their applications will also be studied, for instance ac and dc conductivity, ion-exchange ability or intercalation ability.
Preparation and characterization of new metal phosphonates suitable as: (1) hosts in intercalation reactions. The material should have a layered structure and should be equipped with functional groups able to interact with guest molecules. Other possibility is a use of such metals (e.g. vanadium or copper) which form phosphonates with a metal coordination site available for coordinative intercalation of guest molecules having character of Lewis bases. (2) ion exchangers. Again, suitable functional groups (acidic, i.e., carboxyl or sulfo groups or basic, like an amino group) should be attached to the organic moiety. (3) materials for molecular recognition. The structure of the organic part of the phosphonate is important in this case. We focus our attention to chiral ligands especially those derived from substituted imidazole. A possible catalytic application is also considered for these materials. (4) materials with enhanced proton conductivity. Despite a suitable functional group, the stability of such materials is also important, that is their resistance against increased acidity, humidity and temperature. For such purpose, phosphonates of tetravalent metals such as zirconium or titanium seems to be the most suitable as they are stable at pH below 2. The properties of the prepared compounds relevant for their applications will also be studied, for instance ac and dc conductivity, ion-exchange ability or intercalation ability.
