μ-Squarato-κO:O-bis-{[2-(2-amino-ethyl)pyridine-κN,N']aqua-nickel(II)} squarate 0.25-hydrate

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Tetrahedral Complexes
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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