title: Two furopyridine complexes of nickel(II) isothiocyanate.
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(furo[3,2-c]pyridine)bis(isothiocyanato)nickel(II) tetrahydrofuran (THF) solvate, [Ni(NCS)(2)(C(7)H(5)NO)(4)].C(4)H(8)O 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 degrees. These angles are much larger (69.9-78.8 degrees ) in the centrosymmetric complex tetrakis(2,3-dimethylfuro[3,2-c]pyridine)bis(isothiocyanato)nickel(II) 6.6-hydrate, [Ni(NCS)(2)(C(9)H(9)NO)(4)].6.6H(2)O or [Ni(NCS)(2)(Me(2)fupy)(4)].6.6H(2)O, (II), in which crystallographically imposed inversion symmetry is present.
authors.affiliation: Department of Chemistry, Faculty of Natural Sciences, University of St Cyril and Methodius, SK 917 01 Trnava, Slovakia.
authors.forename: Jozef
authors.initials: J
authors.lastname: Miklovic
authors.forename: Alzbeta
authors.initials: A
authors.lastname: Krutosíková
authors.forename: Peter
authors.initials: P
authors.lastname: Baran