“…17,18 However, there have been few reports regarding the coordination of ligands with the metal atoms of the first main group. 19 In the design and preparation of complexes, it is very important to choose a good ligand. Carboxylic acids not only have many coordination modes, such as single-tooth coordination, symmetrical chelation coordination, asymmetric chelation coordination, single-oxygen-bridge coordination, oxygen-bridge coordination, and so on, but also have strong coordination ability.…”