Two novel anion-directed Cu(II) double betaine coordination polymers with different open frameworks: Inorganic chains [Cu3(μ3-OH)2(μ2-H2O)2]n as secondary building units with unusual chair-like [Cu3O4] cores

Two novel anion-directed Cu(II) double betaine coordination polymers with different open frameworks were synthesized and structurally characterized, both of which are constructed by inorganic copper-oxo chains [Cu3(μ3-OH)2(μ2-H2O)2]n containing unusual chair-like [Cu3O4] units.