3-(1H-Pyrrol-2-yl)-1H-pyrazole forms an unusual hydrogen-bonded two-dimensional (3,4)-connected net

Abstract

The title compound, C7H7N3, is the first crystallographically characterized 1H-pyrrolyl-1H-pyrazole derivative and contains two unique molecules in its asymmetric unit (Z' = 2). These molecules associate into centrosymmetric tetramers through N-H...N hydrogen bonding, including a cyclic dimerization of one of the two unique pyrazole rings. These tetramers are linked further by two weaker N-H...pi contacts to give a novel two-dimensional (3,4)-connected net with a (3(2).8)(2)(3.8(2))(2) topology.