Dendrimer entrapped metal nanoparticles (M-DENs) are widely studied for their potential applications in catalysis,drug delivery,photophysics,diagnosis and sensing.The high level of control over the architecture of dendrimers makes these compounds particularly well-suited for hosting metal ions to yield well-defined and stable nanoparticles[1].Clear advances in catalytic efficiency and selectivity of M-DENs have been made in recent years.However,there are only a few successful progresses in improving the biocompatibility[2].