The reaction of Fe(g5-C5H4CO2Na)(g5-C5H4PPh2) (1), obtained upon addition of NaOH to Fe(g5-
C5H4CO2H)(g5-C5H4PPh2), with stoichiometric amounts of [Co(H2O)6](NO3)2 (2) gave the 1D coordination
polymer [Co(Fe(g5-C5H4CO2)(g5-C5H4PPh2))2]n (3). The molecular structure of 3 in the solid state was
determined by single crystal X-ray structure determination. A unique feature of 3 is that dinuclear
Co2(O2CR)4 units (R = Fe(g5-C5H4)(g5-C5H4PPh2)) are connected by two diphenylphosphino-ferrocenyl
moieties giving rise to a one-dimensional arrangement, whereby the other two Ph2P-containing ferrocenes
remain uncoordinated. Due to this structural feature, the coordination sphere at cobalt(II) can best
be ascribed as distorted octahedral. Variable temperature dependent magnetic measurements were carried
out indicating an overall weak anti-ferromagnetic behaviour with the formation of a weak r bond
with a distance of 2.800(2) Å between the two cobalt(II) ions.