A unique octa-co-ordinated environment for sodium in a new neutral molecular receptor: synthesis and X-ray crystal structure of [NaL]BPh4[L = 1,4,7,10-tetrakis(1-pyrazolylmethyl)-1,4,7,10-tetra-azacyclododecane]
The new pyrazole functionalised macrocyclic ligand 1,4,7,10-tetrakis(1-pyrazolylmethyl)-1,4,7,10-tetraazacyclododecane forms stable complexes with alkali metal cations; the crystal and molecular structure of the complex [NaL]BPh4 has been determined; the cation is in a unique octa-co-ordinated environment formed by the nitrogen atoms of the macrocyclic ligand and the unsubstituted nitrogen atoms of the pendant pyrazole groups.