T
he isotopomeric complexes
trans-W(Cmesityl)[(C(H,
D)
3)
2PCH
2CH
2P(C(H,D)
3)
2]
2(H,D)
1-4 wereprepare
d.
2 (W(C
mesityl)(
dmpe)
2D) was use
d to stu
dy t
he Deuterium Qua
drupole Coupling Constant (DQCC)an
d t
he ionicity of t
he W-D bon
d (DQCC = 34.1 kHz; ionicity 85%).
1 (W(C
mesityl)(
dmpe)
2H) s
hows several
dynamic exc
hange processes in solution, suc
h as H
W/H
W, H
W/
ortho-Me
mesityl, an
d H
W/H
2 exc
hanges observe
dby NMR in combination wit
h deuterium labeling stu
dies an
d double label crossover experiments. Exceptfor t
he H
W/H
2, t
hese reactions comprise elementary steps, w
hic
h also appear along t
he isomerizationpat
hway of
1 into (2,3,5-trimet
hylp
henylcarbyne)(
dmpe)
2WH (
5) at 60
![](/images/entities/<font color=)
deg.gif">C.
5 was c
haracterize
d by an X-ray
diffraction stu
dy. In t
he soli
d state only an H
W/Me
p exc
hange process prevails appearing at
hig
hertemperatures, w
hic
h was i
dentifie
d by NMR an
d by Quasielastic Neutron Scattering. T
he latter also provi
de
dan activation barrier of 5 kcal/mol an
d a "jump wi
dt
h" for t
he moving H nucleus in agreement wit
h t
heH
W···Me
p distance of t
he X-ray
diffraction stu
dy of
1.