The reaction of 1,3,5-triphenyladamantane-bridged trisbenzimidazolium or trisimidazolium salts bearing long alkyl chains with silver oxide affords trinuclear silver(1) hexacarbene complexes with a three-dimensional organometallic framework in moderate yield, where two tricarbene ligands are linked with three metal centers. The complex self-assembles into hollow spherical aggregates in a polar organic solution.