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Generic drawing of tin complexes 18 as well as examples 18a and 18c (for details of L, R and R′ in 18a–18g, see Table 5), related alcoholate bridged dimeric complex 19 [126] and complexes 20 [127] and 21 [128] with related ligands. The counter-ion in the crystal structure of the anionic complex 21 is piperazinium. Note: The Sn atoms of the bridging Me2SnCl2 moieties in 18a are located in distorted octahedral coordination spheres.
