Structural and coordination studies of "pearl oysterlike" porphyrins.
We report the coordination studies of porphyrins with pre-organized but yet flexible straps, each bearing over the center of the porphyrin either a 2,2-malonic acid diethyl ester residue or a 2,2-malonic acid residue. The straps are attached to the porphyrin via two adjacent meso positions, 5,10 and 15,20, respectively, and the 2,2-malonic acid diethyl ester groups are connected to the straps on benzylic carbon atoms. These two structural features allow a significant flexibility of the straps, as confirmed by the comparison of the X-ray structures of the zinc, nickel, and lead complexes of porphyrin 1. In the latter, the influence of the lone-electron pair of lead is clearly demonstrated. The coordination of bismuth is also reported.
Halime
Zakaria
Z
Ingénierie Chimique et Molécules du Vivant, Sciences Chimiques de Rennes, UMR CNRS 6226, Université de Rennes 1, Rennes Cedex, France.
Lachkar
Mohammed
M
Roisnel
Thierry
T
Richard
Philippe
P
Boitrel
Bernard
B