ISSN:
1572-8854
Keywords:
Tetracobalt cluster
;
phosphine ligand
;
regiochemistry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract The thermal substitution chemistry of the tetracobalt cluster Co4(CO)10(μ4-PPh)2 with the phosphine ligand PhPMe2 (2.5 equiv) has been explored and found to afford the bis(phosphine)-substituted cluster Co4(CO)8(PPhMe2)2(μ4-PPh)2 as the major reaction product. The regiochemistry and stereoselectivity exhibited by the two phosphine ligands in Co4(CO)8(PPhMe2)2(μ4-PPh)2 have been unambiguously established by X-diffraction analysis as having a 1,3-cis orientation. Co4(CO)8(PPhMe2)2(μ4-PPh)2 crystallizes in the monoclinic space group P21/n,a=10.314(1) Å,b=18.051(3) Å,c=21.313(2) Å, β=90.10(1)°,V=3968.0(8) Å3,Z=4,d calc=1.590 g cm−3;R=0.051,R w=0.042 for 4987 observed reflections withI〉3σ(I). Generalizations concerning the stereochemical disposition of two P-ligands about the Co4(CO)8P2(μ4-PPh)2 (where P=phosphine or phosphite) polyhedron are discussed with respect to the cone angle of the P-ligand and its steric interactions with the capping phenylphosphinidene group.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02018701
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