4. Carbides MxCy.
like borides, C-C bonds etc; C
4-
is unlikely.
2CuCl + 2NH
3
+ C
2
H
4
Cu
2
C
2
+ 2NH
4
Cl
Acetylides contain discrete C
2
2-
anions.
C
2
2-
isoelectronic with N2
-
C
C
-
, d(C
C) = 1.20 A
Figure 1:
The structure of the acetylides MC
2
with discrete C
2
2-
anions.
Copyright Dr. D. O'Hare 1996.
Cu2C2 + 2NH4Cl
C-, d(C C)
= 1.20 A