A NEW PYRIDINE-BASED PHOSPHORUS-CONTAINING MACROCYCLE - CRYSTAL-STRUCTURE OF [CO(LOX)(2)][COCL3(LOX)](2) (LOX EQUALS -DITHIABICYCLO[9,3,1]PENTADECA-1(15),11,13-TRIENE)

A new pyridine-based macrocycle 9-dithiabicyclo[9,3,1]pentadeca-1(15), 11,13-triene (L),containing the NS2P donor set, was prepared and chara cterised. The reaction of L with CoCl2 in acetonitrile yielded the dou ble complex salt [Co(Lox)(2)][CoCl3(Lox)](2) where the phosphine group s of the ligands L are in their phosphine-oxide form (Lox). The single crystal structure of the complex was determined by X-ray diffraction methods. Crystal data: triclinic, space group P-1 (No. 2),a = 11.534(1 ), b = 19.251(2), c = 9.497(1) Angstrom, alpha = 93.65(1), beta = 109. 711(9), gamma = 95.12(1)degrees, U= 1984.3(4) Angstrom(3), Z= 1. In ea ch [CoCl3(Lox)](-) anion the Co(II) atom is in a slightly distorted te trahedral environment defined by three chlorine atoms and the phosphin e-oxide oxygen atom of one Lox ligand, whereas in the [Co(Lox)(2)](2+) cation the Co(II) atom lies in a distorted octahedral environment of two pyridine nitrogen atoms, two thioether-sulfur atoms and two phosph ine-oxide oxygen atoms provided by two facially coordinating Lox ligan ds. The magnetic behaviour of the complex was investigated.