Three-dimensional networks of lanthanide 1,2,4-triazolates: (3)(infinity)[Yb(Tz)(3)] and (3)(infinity)[Eu-2(Tz)(5)(TzH)(2)], the first 4f networks with complete nitrogen coordination

The solvent-free melt reaction of Eu and Yb with the N-heterocycle 1,2,4-triazole, gives the first three-dimensional networks of the lanthanides with complete nitrogen coordination spheres, further being the first unsubstituted triazolates of the lanthanides and exhibiting different valences.