STUDY ON TETRANUCLEAR TRANSITION METAL CLUSTER WITH μ_3-O BRIDGES I . SYNTHESIS AND CRYSTAL STRUCTURE OF [Fe_4O_2(O_2CCH_3)_7(2,2'-bipy)_2]Cl

INTRODUCTION.The first tetranuelear oxo一bridged manganese eomplex eon-taining〔Mn4OZ〕“+eore was reported on its synthesis,strueture and magnetie proper-ties in 1 987〔‘〕,representing the best available model for the photosynthetie water oxi-dation eentre.In order to find out the relationship of aetivity with eonfiguration ofthis kind of eomplexes,a series of dual oxo一bridged tetranuelear eomplexes have beensynthesized in our laboratory〔2〕.In this paper the aeetato一bridged tetran…

STUDY ON TETRANUCLEAR TRANSITION METAL CLUSTER WITH μ_3-O BRIDGES I . SYNTHESIS AND CRYSTAL STRUCTURE OF [Fe_4O_2(O_2CCH_3)_7(2,2'-bipy)_2]Cl

Fe4O2(O2CCH3)7(2,2'-bipy)2]Cl,Mr=1016.5,monoclinic,C2/c,a=27.628(5),b=11.882(3),c=16.587(3)A,β=119.03(1)°,V=4761.4A3,Z=4,Dc=1.418 g/cm3,λ(MoKa)=0.71069A,μ=13.13 cm-1,F(000)=2088,R=0.062 and Rw=0.077 for 3116 reflections with I≥3σ(I).The title compound contains a Fe4O2]8+core with bridging CH3COO-and terminal bipy groups giving the structure with a C2 symmetry.The arrangement of the four metal atoms is not planar but has a butterfly-like structure with a dihedral angle of 141.58°.