Synthesis and Single Crystal X-Ray Structure Determination of 3,3',5,5'- tetramethyl-4,4'-bipyrazolium tetrachloromanganate(II) monohydrate ([H 2 Me 4 bpz] 2 [MnCl 4 ]Cl 2 ·H 2 O)

The title compound was synthesized mechanochemically by grinding MnCl 2 .4H 2 O and the protonated organic ligand [H 2 Me 4 bpz] resulting in the formation of [H 2 Me 4 bpz][MnCl 4 ]. Suitable single crystal of this compound was analysed through X-ray diffraction technique to ascertain its composition and internal structure. Single crystal structure determination at 100 K revealed needle-like crystals in an orthorhombic crystal system. The asymmetric unit of the cell consists of an isolated chloride ion, one half of a tetrahedral [MnCl 4 ] 2- anion, a [H 2 Me 4 bpz] 2+ dication and one half of a molecule of water. Keywords: Crystal Engineering, Hydrogen Bond, X-ray Crystallography