New steroid dimer derived from cholic acid as receptor for lanthanum(III) and calcium(II) nitrates

New steroid dimer, ethylene bridged bis-carbamate (3) was synthesized from cholic acid in few steps. Complexes of 3 with lanthanum(III) and calcium(II) nitrates were prepared in reaction of 3 and appropriate metal salts. They were characterized by spectral data (Infrared (IR), ultraviolet-visible (UV/Vis), nuclear magnetic resonance (NMR) spectroscopy and fast-atom bombardment (FAB), electrospray (ESI) and matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS)) and elemental analysis. The similarity in complexing behavior of steroidal dimer toward calcium and lanthanum ions was observed.