In this work, the encapsulation of the transition metal complexes cis -Pt(NH 3 ) 2 Cl 2, Ru(bpy) 3 2+, and Ru(phen) 3 2+ within layers of hydroxyapatite on a porous Si/Si substrate are described. These specific complexes were selected as a consequence of their biological activity ( cis -Pt(NH 3 ) 2 Cl 2 ) or polynucleotide binding ability (Ru(bpy) 3 2+ and Ru(phen) 3 2+ ). The complex-doped hydroxyapatite/porous Si/Si materials have been characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, secondary ion mass spectrometry, and photoluminescence spectroscopy. It is possible to exercise some control of the release of a given complex into the surrounding medium through thermal heating of the complex-doped hydroxyapatite/porous Si/Si structure.
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Li et al. (1998) studied this question.
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