Chemistry Reference
In-Depth Information
Figure 4.15
Hexanuclear {(H
2
O)
2
Cu
2
(
µ
3
-(Ade)
4
[Cu(oda)(H
2
O)]
4
}·6H
2
O complex with wind-
mill topology
Figure 4.16
Schematic representation of the pentanuclear metallomacrocycles formed
between the 2,2
′
-dipyridylketoneplatinum(II) entity and thymine or uracil
phosphate), via hydrogen bond formation between the exocyclic oxygen atoms of
the coordinated nucleobases and the anions. The chelate ligands 2,2
′
- dipyridiylke-
tone and 2,2
-dipyridiylketone hydrate provide further functional groups, supple-
mentary to those of the DNA bases, for the formation of a dense hydrogen-bond
network. These characteristics provide new potential applications in anion recogni-
tion and complexation.
A molecular hexagon was obtained using the
trans
- [(Pt(CH
3
NH
2
)
2
(1 -
MeC
2−
)
2
](NO
3
)
2
(1 - MeC
2−
= dianion of 1 - methylcytosine), fi xing a head-head
arrangement by metal binding (with Hg
II
) to the deprotonated exocyclic amino
groups. Electrophilic attack of excess Hg(II) salts at the C5 positions of the two
cytosine ligands leads to the cyclic [{Pt(CH
3
NH
2
)
2
(C
5
H
3
N
3
O)
2
Hg
3
(OH)(NO
3
)}
2
]
(NO
3
)
4
. The basic form of this centrosymmetric cation is a compressed hexagon
′
