Prof. Hiroshi Kitagawa and Dr. Hirokazu Kobayashi are searching for novel methods for introducing functionalities into porous coordination polymers (PCPs) by hybridization with metal nanocrystals. PCPs are organic窶妬norganic hybrid solids with zeolite-like structures and porous properties. Due to their high surface area and designable pore size with hydrophilic or hydrophobic characteristics, PCPs have attracted much attention as practical adsorbents or membrane materials to separate gases on industrial scale. Metal nano-crystals, on the other hand, play an important role as the effective catalysts for various reactions. The hybridization of the two should deliver enhanced catalytic capabilities. The synergy effect between PCPs and metal nanocrystals is expected to be highly selective and active, and to provide a clean and green environment.