A diffraction-quality single crystal of FeCl 2 (pym) was mounted on a polymer-tipped MiTeGen MicroMountTM using Fomblin (YR-1800 perfluoropolyether oil). The sample was cooled rapidly to 120 K in a stream of cold N 2 gas, using a Oxford Cryosystems open flow cryostat. Diffraction data were collected on an Oxford Diffraction GV1000 (TitanS2 CCD area detector, mirror-monochromated Cu-Kα radiation source; λ = 1.54184 Å, ω scans). Cell parameters were refined from the observed positions of all strong reflections and absorption corrections were applied using a Gaussian numerical method with beam profile correction (CrysAl-isPro). The structure was solved and refined in Olex2 76 using SHELXT and SHELXL , respectively.