Synthesis and crystal structure study of (R,R)-TMCDA ethanol derivatives doubly protonated with FeCl4 - and Cl- as counter-ions.

The synthesis and structural characterization of the crystal forms of (R,R)-TMCDA and its ethanol derivative, both doubly protonated with FeCl4 - and Cl- as counter-ions, are reported, namely, (R,R)-N 1,N 1,N 2,N 2-tetra-methyl-cyclo-hexane-1,2-bis-(aminium) tetra-chlorido-ferrate chloride, (C10H24N2)[FeCl4]Cl (1a), and (R,R)-N 1-(2-hy-droxy-eth-yl)-N 1,N 2,N 2-tri-methyl-cyclo-hexane-1,2-bis-(aminium) tetra-chlorido-ferrate chloride (C11H26N2O)[FeCl4]Cl (2a). A notable feature across both synthesized compounds is the presence of N-H⋯Cl hydrogen bonds of moderate strength in the solid state. In the case of the ethanol derivative of (R,R)-TMCDA, the structure also reveals the formation of inter-molecular O-H⋯Cl hydrogen bonds.