Responsive catalytic hybrid nanogels with Au nanoparticle cores and a polyvinylpyrrolidone (PVP) based gel shell are prepared through a novel one-pot approach. The embedded Au nanoparticles demonstrate both a pH-modulated catalytic activity and anti-aggregation properties upon recycling.

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Treatment of OsCl 2 (PPh 3 ) 2 (CHC(PPh 3 )-CH(OH)-η 2 -CCH) (1) with PPh 3 and Bu 4 NCl in CH 2 Cl 2 under air gave paramagnetic osmacyclopentene [OsCl 2 (PPh 3 ) 2 (CHC(PPh 3 )CH(OH)C(CH(PPh 3 )))] Cl (5). Heating the suspension of 5 in CH 2 Cl 2 under a nitrogen atmosphere led to the formation of η 2 -allenecoordinated osmacycle OsCl 2 (PPh 3 )(CHC(PPh 3 )CH CCH(P(C 6 H 4 )Ph 2 )) (6) and chloro-osmabenzene OsCl 2 (PPh 3 ) 2 (CHC(PPh 3 )CHCClCH) (7) via disproportionation reaction. Oxidative transformation of 5 under an oxygen atmosphere yielded osmafuran [OsCl(PPh 3 ) 2 (CHC-(PPh 3 )CHO)(CC(PPh 3 ))]Cl (10). In addtion, complexes 6, 7, and 10 can also undergo ligand substitution reactions with NaSCN to afford more stable analogues.

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