| Abstract: | Pyridine fused with a furan ring (fupy), and its dimethyl derivative, have been used for the first time as ligands to synthesize potentially new Werner clathrates. The extended aromatic system of pyridine‐like ligands influences considerably the molecular structure of prepared nickel complexes. The molecular structure of tetrakis(furo3,2‐c]pyridine)bis(isothiocyanato)nickel(II) tetrahydrofuran (THF) solvate, Ni(NCS)2(C7H5NO)4]·C4H8O or Ni(NCS)2(fupy)4]·THF, (I), reveals a `four‐blade propeller' arrangement of ligands, with the angles between the fupy planes and the basal octahedron plane spanning the range 38.7–55.3°. These angles are much larger (69.9–78.8°) in the centrosymmetric complex tetrakis(2,3‐dimethylfuro3,2‐c]pyridine)bis(isothiocyanato)nickel(II) 6.6‐hydrate, Ni(NCS)2(C9H9NO)4]·6.6H2O or Ni(NCS)2(Me2fupy)4]·6.6H2O, (II), in which crystallographically imposed inversion symmetry is present. |
