“Scorpionate-like” complexes that are held together by hydrogen bonds: Crystallographic and spectroscopic studies of (3-NH(t-butyl)-5-methyl-pyrazole)nMX2 (M = Zn, Ni, Co, Mn; n = 3, 4; X = Cl, Br)

Amino-substituted pyrazole ligands form 3:1 and 4:1 transition metal complexes with zinc(II), cobalt(II), manganese(II), and nickel(II). These complexes exhibit hydrogen bonds between NH groups and halide ions. Thus these are “scorpionate-like” metal complexes that are held together by hydrogen bonds rather than covalent bonds.66