We　report　here　the　study　of　different　peripherally　modified　palladium　phthalocyanine　(PdPc)　encapsulated　in　silica　gel　glass　obtained　by　sol-gel　technique.　The　resulted　composites　were　transparent　and　homogeneous　with　required　optical　limiting　properties.　Trapping　effect　was　checked　by　UV/Vis　absorption　spectra　and　pore　structure　of　the　composites.　Optical　limiting　properties　were　measured　at　532　nm　with　8　ns　pulses.　The　results　show　that　all　the　PdPcs　have　better　optical　limiting　effect　in　composite　than　in　solution,　among　which,　PdPc-C　has　the　best　optical　limiting　effect　due　to　its　largest　peripheral　substituent.　©　2004　Elsevier　B.V.　All　rights　reserved.