Bioinspired catalytic reactions with vitamin B 12 derivative and photosensitizers

As part of a study directed toward design of good catalytic systems based upon a hydrophobic vitamin B 12 , heptamethyl cobyrinate perchlorate, we describe the preparation of various nanomaterials using the vitamin B 12 derivative and photosensitizers. Examples include vitamin B 12 -hyperbranched polymers (HBPs), human serum albumin (HSA) con- taining vitamin B 12 derivatives, a vitamin B 12 -titanium dioxide hybrid catalyst, a vitamin B 12 -Ru complex combined system, and a vitamin B 12 -rose bengal combined system. These bioinspired materials have the potential as catalytic systems for the degradation of organic halide pollutants and for molecular transformations via radical intermediates during irradia- tion by UV or visible light, and offer a variety of applications that are of great interest in terms of green chemistry.