Crown-shaped tetrametallic imidoyl complexes of palladium. X-Ray crystal structure of [{[Pd2{µ-C(C6F5)NMe}2](µ-Cl)(µ-MeCO2)}2]
Usón, Rafael; Forniés, Juan; Espinet, Pablo; Lalinde, Elena; García, Augustín; Jones, Peter G.; Meyer-Bäse, Karen; Sheldrick, George M.
Журнал:
Journal of the Chemical Society, Dalton Transactions
Дата:
1986
Аннотация:
The complexes [{[Pd2{µ-C(C6F5).dbd6;NR<sup>1</sup>}2](µ-X<sup>1</sup>)(µ-X<sup>2</sup>)}n](R<sup>1</sup>= Me or p-tolyl; X<sup>1</sup>= X<sup>2</sup>= Cl) and their derivatives (X<sup>1</sup>= Cl, X<sup>2</sup>= MeCO2 or CF3CO2; X<sup>1</sup>= X<sup>2</sup>= MeCO2 or CF3CO2), obtained by metathetical reactions with the corresponding silver salts, are shown to be tetrametallic (n= 2) by molecularweight determinations. Their structures are discussed on the basis of <sup>1</sup>H and <sup>19</sup>F n.m.r. data. The crystal structure of the title complex has been solved by X-ray diffraction methods [space group P21/n, a= 14.380(4), b= 19.980(4), c= 15.976(4)à , β= 103.51(3)°, Z= 4, Râ ²= 0.046 for 5 428 unique observed reflections]. The tetrametallic molecule is crown-shaped. The bond lengths at palladium reflect the strong trans influence of the imidoyl-C atom; the Pdâ Cl bonds trans to C are amongst the longest known.
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