First, thanks choscar and reuben's discussion!
I expect other guys may have some interesting topics to share.
The following is my point of views that may be right or may not. Anyway, let's discuss!
1) Besides its structural novelty (the first known examples of square planar halide complexes with main group element), the more important for the title compound is that its synthesis revealed anion-templated synthesis, especially the halide-templated synthesis may afford easy access to various novel main group assemblies.
2) See Reuben’s comments
3) In article’s experimental part
4) See Reuben’s (Thanks a lot for your explanation!
)
5) Block (e.g., Cube)> Rod (column)> Thin plate & needle
6) Without considering X anion, the geometry of Sb distorted trigonal pyramidal (
figure 1) (C-Sb-C, 107°, C-Sb-P, 90°); if considering X anion, it is seesaw geometry (
figure 1).
About the coordinative geometry around central X, it indeed is square planar (X is coplanar to the four Sb atoms, but not perch above the plane containing four Sb atoms (square pyramidal). See
figure 2.
7) Reuben is right. Disorder makes it difficult to evaluate this kind of interaction. Personally I think it is present. See
figure 3.
8) About Menshutkin interaction, I agree with Reuben. However, I believe it is very weak in this case since the lone pair of Sb is not very nicely point to the center of the phenyl ring.
9) Choscar is right. By tuning the steric effect of the ligand one may achieve smaller size ring or linear structure (just deduce!). Considering azo-carbene has very similar property to phosphine, I suggest the following synthetic target (
figure 4).
[
本帖最后由 niuniu123 于 2006-8-1 10:23 编辑 ]
- 