Treatment　of　[Os3(CO)10(NCMe)2]　with　an　equimolar　amount　of　4-vinylpyridine,　4-ethynylpyridine　and　4-ethylpyridine　at　room　temperature　readily　gave　the　cluster　complexes　[Os3(μ-H)(CO)10(μ-NC5H3CH　=　CH2)]　1,　[Os3(μ-H)(CO)10(μ-NC5H3C≡CH)]　2　and　[Os3(CO)10(μ-H)(μ-NC5H3CH2CH3)]　3,　respectively.　The　corresponding　ruthenium　analogue　of　1,　[Ru3(μ-H)(CO)10(μ-NC5H3CH　=　CH2)]　4,　was　also　prepared　in　good　yield　by　thermal　reaction　of　Ru3(CO)12　with　4-vinylpyridine.　Then,　five　thermally　stable　polymer-immobilized　clusters　of　osmium　5–9　have　been　synthesized　by　the　solution　copolymerization　of　triosmium　cluster-based　monomers　1　and　2　with　styrene,　methyl　methacrylate,　vinylferrocene　and　4-vinylphenylboronic　acid,　respectively,　in　the　presence　of　α,α′-azobis(isobutyronitrile)　(AIBN)　in　chloroform　at　60　°C.　Characterization　of　all　new　compounds　was　achieved　by　a　combination　of　FTIR,　NMR,　MS,　GPC,　electronic　absorption　and　thermal　gravimetric　analysis　techniques.　Crystal　structure　determinations　were　also　carried　out　for　complexes　1,　3　and　4.　©　2018　Elsevier　B.V.