68868-44-0Relevant academic research and scientific papers
Iridium(I)-salicylaldiminato-cyclooctadiene derivatives: Structural features and dynamic behavior
Bonnaire,Manoli,Potvin,Platzer,Goasdoue
, p. 2691 - 2696 (2008/10/08)
The reaction of [(Ir(OCH3)(cod))2] (cod = 1,5-cyclooctadiene) with bidentate Schiff base (sb) derived from salicylaldehyde (sal) gives compounds of the general formula [Ir(sb)(cod)]. The structure of one complex of this type has been solved by X-ray diffraction techniques in order to explain the 13C NMR spin-lattice relaxation time (T1) studies. The complex [Ir(sal=N-o-tol)(cod)] crystallizes in the centrosymmetric monoclinic space group P21/c with a = 10.776 (4) ?, b = 9.882 (2) ?, c = 19.554 (5) ?, β = 118.06 (3)°, V = 1837.5 ?3, and Dcalcd = 1.84 cm-3 for mol wt 510.6 and Z = 4. Diffraction data were collected with an Enraf-Nonius CAD-4 diffractometer, and the structure was solved and refined via a combination of Patterson, difference Fourier, and full-matrix least-squares techniques. The final discrepancy indices are R = 0.043 and R, = 0.044 for 3417 independent reflections with 2θ ≤ 60° (Mo Kα radiation). Important bond lengths are Ir(I)-N = 2.099 (9) ?, Ir(I)-O = 2.004 (8) ?, and Ir(I)-C(olefin) = 2.05 (1)-2.16 (1) ?. The salicylidene moiety (ring A) is approximately perpendicular to the o-tolyl group (ring B). Comparison between the 13C spin-lattice relaxation times (T1) of ring A and ring B of a series of complexes with different B rings shows that any rotation of this latter ring is excluded. Only a small tumbling of ring B is assumed.
