ISSN:
1572-8862
Keywords:
Iridium
;
phosphido-bridging
;
carbonyl
;
octahedron
;
cluster
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The phosphido-bridged cluster [Ir6(CO)14 PPh2]− has been obtained by reaction of [Ir6(CO)15]2− with PHPh2, in the presence of ferrocenium cation, followed by deprotonation. The anion was isolated as a salt of [N(PPh3)2]+ or K+ and its structure was determined by single crystal X-ray data analysis. The salt [N(PPh3)2][Ir6(CO)14PPh2] crystallizes in the triclinic space group P $$\bar 1$$ witha = 11.835(1) Å,b = 15.007(1) Å,c = 18.766(2)_ Å; α = 78.779(7)°,β = 87.260(8)°,γ = 75.794(6)°,V = 3169.3(7) Å,Z = 2. The structure was solved by Direct Methods and Difference Fourier techniques and refined down toR andR w values of 0.034 and 0.036, respectively, for 8003 observed reflections havingl 〉 3σ(I). The octahedral anion, of idealized C2 symmetry, possesses two distance Ir-P = 2.284 Å, formally acting as a three electron donor. Average bond distances (Å) and angles (degrees) are: Ir-Ir = 2.776, Ir-C t = 1.87, Ir-C b = 2.05, C t -O t = 1.14, C b -Ob= 1.17, Ir-P-Ir = 74.3°, Ir-C t -O t = 177°, Ir-C b -O b = 138°, Ir-C b -Ir = 84° (t = terminal,b = bridging).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01170718
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