Encapsulation of tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) complex linked with dendrons in sol-gels: Stable optical sensing membranes for dissolved oxygen.
To circumvent the leaching problem of optical sensing membranes used for dissolved oxygen (DO) measurements, the encapsulation of Ru(II) complexes linked with bulky dendron(s) in a sol-gel matrix was investigated. A dendron, readily formed via chemical transformations such as amidation and catalytic reduction, was covalently incorporated into tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) complex, leading to an increase in the size and lipophilicity of dye molecules. Sol-gel-based sensing membranes encapsulating these Ru(II) complexes displayed a strong luminescence emission at 590 nm induced by radiation at 480 nm, and showed excellent DO sensing properties and stability for repeated measurements in aqueous solution. The encapsulation of the dendron-incorporated Ru(II) complexes in sol-gels prevented the dyes from leaching out of the membranes.
Kim
Hyung Jin
HJ
Center for Functional Nano Fine Chemicals, School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea.
Jeong
Yong Chae
YC
Rhee
Jong Il
JI