The halogen bonding (XB) in metal carbonyls blueshifts the νCO band and XB directionality is dictated by XB-accepting atom hybridization.

The reaction of (NBu4)2Bzmal (where Bzmal2− is benzylmalonate dianion) with Co(OAc)2∙4H2O gives the [Co(Bzmal)(EtOH)(H2O)]n 2D-polymer (1). The addition of 2,2′-bipyridine (bpy) to the starting system results in the [Co(Bzmal)(bpy)2]·H2O·EtOH molecular complex (2). Their molecular and crystal structures were analyzed by single-crystal X-ray crystallography. An analysis of the static magnetic data supported by the SA-CASSCF/NEVPT2 calculations revealed the presence of easy-plane magnetic anisotropy in both complexes. The AC susceptibility data confirm that both complexes show a slow field-induced (HDC = 1000 Oe) magnetic relaxation behavior.

Bromination of the bicyclic selenoether (2,6-dibromo-9-selenabicyclo[3.3.1]-nonane) affords the products ranging from the unique molecular complex C8H12Br2Se–Br2 to the ionic polybromide complex [C8H12Br2SeBr+]Br5.

Along with the reported earlier co-crystal of diphenyl ditelluride (Ph2Te2) and halogen bond donor 1,4-diiodo-tetrafluorobenzene (p-DITFB) 1α, its two new polymorphic forms (1β and 1γ) present a rare case of...