Syntheses, crystal structures and properties of one sodium(I) directed three-dimensional coordination polymer and one propeller-like dinuclear copper(II) complex with (1S,3R)-3-carbamoyl-2,2,3-trimethylcyclopentane-1-carboxylate

A sodium(I) complex and a propeller-like dinuclear copper(II) complex formulated as [Na3(L)(OH)2(H2O)2]n (1) and [Cu2(L)4(H2O)2] (2) [LH=(1S,3R)-3-carbamoyl-2,2,3-trimethylcyclopentane-1-carboxylic acid which is also known as (1R,3S)-1-monoamidocamphoric acid and (1R,3S)-β-camphoramic acid] have been synthesized and characterized, respectively. X-ray single crystal determinations of 1 and 2 reveal that three types of sodium(I) centers are present in 1 and a 3D framework is constituted with the help of the weak coordinative bonds as well as the hydrogen bonding interactions, while 2 forms a tetrakis(μ2-carboxylic)-bridged dinuclear diaqua copper(II) complex with the Cu-Cu separation 2.601(4) Å. In 2, half of the ligands undergo the configuration inversion. It is deduced that the formation of the robust five-membered coordination ring (Cu2CO2) and the α-hydrogen atom of carboxylic group contribute this racemization. In addition, magnetic properties of 2 are also discussed.