Bis(1,8-diazabicyclo[5.4.0]undec-7-en-8-ium) trans-Dichlorotetra(pyridine-N)iron(II) Dichloride

The title compound, (C 9 H 17 N 2 ) 2 [FeCl 2 (C 5 H 5 N) 4 ]Cl 2 , consists of well separated [FeCl 2 (NC 5 H 5 ) 4 ] complex molecules, 1,8-diazabicyclo[5.4.0]undec-7-en-8-ium (HDBU + ) cations and Cl - anions. The Fe atom, located at an inversion center, is octahedrally coordinated, with the two chloro ligands arranged trans. The Fe-Cl distance is 2.4067 (8) A. The N atoms of the four pyridine ligands constitute the equatorial plane, with Fe-N distances in the range 2.273 (3)-2.279 (3) A.