Self-assembled Transition Metal Coordination Frameworks of ...

Manganese(Il) complexes
lcmzmoll inlO4 M DMF solutions respectively for 21, 22 and 23, which is found
comparable to the behaviour of molecular squares of other metals. The complex 19 is
assigned to a molecular square grid of formula [Mn2(l-lL2)L2]2Cl;- CHCl3- 91-I20, while
20 to be a dinuclear complex [Mn2(l-lL3)L3- 2l-l2O]- 21-I20. The other three complexes
21,
__
22 and 23 are assigned
22+
to a general formula [Mn2(H;L)HL]2(ClO4)6- nH2O. The
tentative structures of these complexes are shown in Schemes 5.1 and 5.2.
., /’\/
:2] \~./~\/v~\..x
R /\ . V / Mn * R
R
/ / \.... \ N‘ H
y
\ Mr1._ H . I‘ / : I ‘i N
s §,.~s O
S \ _\
N _N
/ \. N-l N-J’; / “N /N/ \ I
' N—\ Mn X / \ \ ,Mn QQN’/N§*" N / \\ N1 HN N\“N/
_—_-/ N/ N1 \= IN n o \ Mn / / /
N
\//
._ 4/\
Scheme 5.2. Tentative structures of complexes 21 and 22 (left) and 23 (right). X=
O. R= pyridyl for 21 and phenyl for 22. The exact positions of —NI-I hydrogens
shown in these three complexes are uncertain.
201