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

Abstract

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)-N1,N1,N2,N2-tetramethylcyclohexane-1,2-bis(aminium) tetrachloridoferrate chloride, (C10H24N2)[FeCl4]Cl (1a), and (R,R)-N1-(2-hydroxyethyl)-N1,N2,N2-trimethylcyclohexane-1,2-bis(aminium) tetrachloridoferrate 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 intermolecular O—H...Cl hydrogen bonds.

Keywords

• crystal structure
• (r,r)-tmcda
• stereogenic carbon center
• hydrogen bonds
• (r,r)-tmcda ethanol derivative