Diaquadichloridobis(pyridine-κN)manganese(II)

The molecular title compound, [MnCl2(C5H5N)2(H2O)2], lies about an inversion centre. The MnII atom is in an all-trans octahedral environment defined by two water molecules, two chloride anions and two pyridine ligands. An intermolecular hydrogen-bonding interaction between a water molecule and a chloride anion bonded to an adjacent MnII atom generates an eight-membered ring. The crystal packing exhibits two intermolecular π–π stacking interactions between the aromatic rings, with centroid–centroid distances of 3.485 (12) and 3.532 (12) Å.

The molecular title compound, [MnCl 2 (C 5 H 5 N) 2 (H 2 O) 2 ], lies about an inversion centre. The Mn II atom is in an all-trans octahedral environment defined by two water molecules, two chloride anions and two pyridine ligands. An intermolecular hydrogen-bonding interaction between a water molecule and a chloride anion bonded to an adjacent Mn II atom generates an eight-membered ring. The crystal packing exhibits two intermolecularstacking interactions between the aromatic rings, with centroid-centroid distances of 3.485 (12) and 3.532 (12) Å .
BM thanks the Council of Science and Industrial Research (CSIR), Government of India, for financial support. We are thankful to the Department of Science and Technology (DST), Government of India, for providing the single crystal X-ray diffractometer facility at the Department of Chemistry, Pondicherry University, under the DST-FIST program.

Comment
The molecular structure of the title compound C 10 H 14 Cl 2 MnN 2 O 2 is isostructural with Cr (Cotton et al., 1995) compound.

Experimental
A solution of manganese(II) chloride tetrahydrate (692 mg, 3.5 mmol) in distilled water (2 ml) was added a solution of pyridine (0.28 ml, 3.5 mmol) in a 1:1 ethanol-water mixture (2 ml) slowly. Colorless white crystals began to form at ambient temperature after a week.

Refinement
The non-hydrogen atoms were refined anisotropically whereas hydrogen atoms were refined isotropically. The other hydrogen atoms were placed in calculated positions (C-H = 0.93 Å) and included in the refinement in a riding-model approximation with U iso (H) =1.2U eq (C). The water H atoms were refined with a distance restraint. Fig. 1. : The molecular structure of title compound, showing displacement ellipsoids drawn at the 50% probability level.