Self-healing phenomena are attracting much attention for developing sustainable structural materials; [1] extensive studies have been reported on polymeric materials capable of selfrepairing macroscopic fractures or recovering lost mechanical strengths.[2] On the other hand, for exploiting molecular devices that can self-repair elaborate functions, different problems may be encountered that originate from much smaller size regimes. For example, design of self-repairable optoelectronic devices, which are potentially important for sensor and display applications, [3,4] certainly requires a particular trick to realize self-reconstruction of elaborate molecular geometries for electronic communication. However, no rational strategies have yet been proposed for addressing this challenging issue.As the first step toward this goal, we report herein that a cylindrical assembly of a trinuclear gold(I) pyrazolate complex, [Au 3 Pz 3 ] (Figure 1 a), [5] when confined in a one-dimensional silicate channel (Figure 1 b), shows self-repairable luminescence properties owing to a nanoscopic template effect. The luminescence center of this assembly (Figure 1 a) adopts a chair-like coordination geometry [5h,j] of polymeric [Au 3 Pz 3 ] formed by a Au I -Au I metallophilic interaction. As this interaction is only as strong as a hydrogen-bonding interaction,[5c] the cylindrical assembly can easily be disrupted upon heating and lose its luminescence capability. However, we found that the thermal resistivity of the luminescence capability is enhanced when the assembly is confined into nanoscopic channels of mesoporous silica (Figure 1 b). Furthermore, the luminescence that was lost upon heating is autonomously recovered to 100 % when the material is held at 20 8C.To incorporate the cylindrical assembly of [Au 3 Pz 3 ] into nanoscopic silicate channels, we employed the sol-gel synthesis of mesoporous silica templated by rod micelles of surfactants.[6] In 2001, we [7] and other groups [8] demonstrated that, by using functional amphiphiles as templates, a variety of organic functionalities can be incorporated into nanoscopic channels of the resulting mesoporous silica.[9] In contrast to post-functionalization, [10] this method ensures dense filling of the silicate channels with organic functional groups.[9] Herein, we newly synthesized [Au 3 Pz 3 ] (Figure 1 a), which is an amphiphilic version of the metal pyrazolate complexes designed for phosphorescent organogels [5i] and liquid crystalline assemblies [5j] with metallophilic interactions. For the synthesis of [Au 3 Pz 3 ], the pyrazole ligand C 10 TEGPzH was prepared (Supporting Information, Scheme S1) [11] and allowed to react with [Au(Me 2 S)]Cl in THF/MeOH in the presence of KOH at room temperature.[5g,i] After being stirred for 12 h, the reaction mixture was subjected to preparative