Synthesis and structural characterization of a [Ag4]4+ cluster stabilized by a mixed-donor N-heterocyclic carbene linked cyclophane and the first reported synthesis of a N-heterocyclic carbene complex in water

The synthesis of the tetranuclear Ag44+ cluster stabilized by a N-heterocyclic carbene macrocycle (3)[PF6]4. Decomposition of the tetranuclear cluster (3)[PF6]4 in light forms the dimeric species (2)[PF6]2. In situ synthesis of the dimeric silver N-hetrocyclic carbene complex (2)[Br]2 in water.