Metallo-Ligand [Cu^II(carboxylato)₄]²⁺ Cores: Tetrakis(trimethylammonioacetato-O)copper Diperchlorate and its 1/1 Complex with Sodium Perchlorate

The crystal structure of tetrakis(trimethylammonioacetato-O)copper diperchlorate, [Cu(C₅H₁₁NO₂)₄](ClO₄)₂, consists of discrete [Cu{(CH₃)₃NCH₂CO₂}₄]²⁺ cations and ClO₄⁻ anions. The Cu atom is coordinated by four trimethylammonioacetate ligands in a square-planar geometry. The compound forms a 1/1 complex with sodium perchlorate, i.e. perchlorato-2κO-bis(μ-trimethylammonioacetato)-1:2κ⁴O– bis(trimethylammonioacetato)-1κ²O-coppersodium diperchlorate, [Cu(C₅H₁₁NO₂)₄{Na(ClO₄)}](ClO₄)₂, in which the copper and sodium atoms are bridged by either three μ₂-carboxylato-O,O' or two μ₂-carboxylato-O groups to give rise to a linear cationic chain.

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