An N2S3-Type Co(III) Complex Adsorbed into Mesopores of FSM as a High-Performance Device
A distorted square-pyramidal N2S3-type Co(III) complex with a vacant site was previously synthesized as an active site model of Nitrile hydratase (NHase), and the coordination behavior of a water molecule to the vacant site was discussed. In this paper, the coordination of other monodentate ligands (CN-, tBuNC) to the complex was studied using UV-vis and IR spectral measurements. The UV-vis spectra changed with isosbestic points at ca. 300 nm and 370 nm by addition of CN- or tBuNC. The IR spectra showed C≡N stretching vibrations at 2112 and 2197 cm-1, respectively, both of which are different from those of the respective metal-free ligands, CN- (2069 cm-1) and tBuNC (2135 cm-1). These results indicate that CN- and tBuNC can coordinate to the vacant site of the Co(III) complex. Furthermore, we tried the adsorption experiments of the complex into FSM (folded-sheet mesoporous metarial) with hydrophobic mesopores. The adsorption amount of PPh4[Co(L1-O4)] for FSM exhibited a high value of ∼40 w/w% in CH2Cl2, although such an adsorption behavior was not observed in MeOH.
Masayuki Nogami, Riguang Jin, Toshihiro Kasuga and Wantai Yang
T. Yano, T. Ikeda, Y. Funahashi, T. Ozawa, H. Masuda, "An N2S3-Type Co(III) Complex Adsorbed into Mesopores of FSM as a High-Performance Device", Advanced Materials Research, Vols. 11-12, pp. 347-350, 2006