Synthesis and structure of a (4,4′-bipyridine) lanthanide(III) complex with tetraimine (2+2) macrocycle from 2,6-diformyl-4-chlorophenol and 1,3-diamino-2-hydroxypropane

A novel (2+2) macrocyclic Schiff base lanthanide(III) complex [La(H4L)(NO3)3]·(4,4′-bipy)·2H2O has been synthesized by template condensation of 1,3-diamino-2-hydroxypropane and 2,6-diformyl-4-chlorophenol. The compound crystallizes in the orthorhombic space group Pnma with a = 16.400(3), b = 12.985(3), c = 19.118(4) A, and Z = 4. In the macrocycle, La3+ was coordinated by two imino nitrogen atoms, two phenolic oxygen atoms, one pedant alcoholic oxygen atom, and six nitrate oxygen atoms. It is interesting that the neutral lanthanide macrocyle forms a saddlelike supramolecule with 4,4′-bipyridine.