The aim of anchoring the cobalt-iron tetranuclear carbonyl cluster FeCo3(CO)12- on the phosphinated surface of the polystyrene through ligand substitution was to obtain the cluster FeCo3(CO)11PPh3-/poly. The structural model of the mol. studied was the same as in the FeCo3(CO)11PPh3- crystal: the phosphine ligand was indeed bonded to one Co atom. In comparison with those of FeCo3(CO)12-, the structure has a three-fold symmetry. The bond length Co-Fe was longer by 0.005 nm. The Debye-Waller factors of the M-M and M-C(b) (M = metal; C(b) = bridging carbon) shells were about two times greater, but that of C(t) (C(t) = terminal carbon) shell, remained almost the same. In comparison with the FeCo3(CO)11PPh3- structure, the Co-Fe bond length was 0.003 nm longer, and the Co-Co bond length was 0.0 (2 nm shorter. The distortion of FeCo3(CO)11PPh3- is caused by substituting one CO by PPh3.

Key words: POLYSTYRENE, IRON COMPLEX, CARBONYL COMPOUNDS, TRIPHENYLPHOSPHINE, COBALT COMPLEX