1-Acetyl-3-ferrocenyl-5-methyl-1H-pyrazole and 1-acetyl-5-ferrocenyl-3-(2-pyridyl)-1H-pyrazole.

Molecules of 1-acetyl-3-ferrocenyl-5-methyl-1H-pyrazole, [Fe(C5H5)(C11H11N2O)], form a centrosymmetric dimer generated by a combination of one C-H...pi(pyrazole) and one C-H...pi(cyclopentadienyl) interaction. The dimers are linked by C-H...pi interactions, involving the pyrazole rings as acceptors, into layers parallel to (10-1). Molecules of 1-acetyl-5-ferrocenyl-3-(2-pyridyl)-1H-pyrazole, [Fe(C5H5)(C15H12N3O)], are linked by C-H...O interactions into a chain running in the [010] direction. Two chains of this type passing through each unit cell are connected by O...pi(pyridyl) interactions into an [010] double chain.