Polychlorotriphenylmethyl Radicals: Towards Multifunctional Molecular Materials - Stable Radicals: Fundamentals and Applied Aspects of Odd-Electron Compounds - page 47

O4

O3

O2

Cu 1

O1

O5

(a)

0,9

1,2

0,8

1,0

0,7

S 1 = 1/2

0,8

Cu II

J

J

0,6

0,6

J J

Cu II

J 13

0,5

S 1 = 1/2 S 2 = 1/2 S 3 = 1/2 S 4 = 1/2 S 2 = 1/2

0,4 J

J

Cu II

0,4

S 3 = 1/2

0,2

0 50 100 150 200 250

T/K

0 50 100 150 200 250

T/K

(b)

Figure 2.10 (a) ORTEP view of [Cu 2 ( 7 ) 2 (O 2 CH 3 ) 2 (H 2 O) 2 ]( 11 ); (b) Temperature dependence of the magnetic
susceptibilities. The inset figures show the schematic arrangements of the metal ions and organic radicals.
(Reprintedwithpermissionfrom[47].Copyright2002RoyalSocietyofChemisty.)

Figure 2.11 Left: Coordination polymer created by an inorganic subunit (0-D clusters or isolated metal ions)
connectedthroughpolytopicorganicligands.Right:Purelyorganicopenframeworkformedbyorganicmolecules
interlinkedthroughnon-covalentbondssuchashydrogenbondsor interactions.(Reprintedwithpermission

from[53].Copyright2007RoyalSocietyofChemistry.)Afull-colourversionofthisfigureappearsintheColour
Platesectionofthis topic.

π - π

brings the possibility to obtain porous materials with additional electrical, optical or magnetic properties.
Among them, the search for magnetic open framework structures has become a major objective due to their
potential applications in the development of low density magnetic materials, magnetic sensors and intelli-
gent or multifunctional materials. Indeed, a large number of pure inorganic materials, organic - inorganic
hybrid materials and coordination polymers with magnetic properties have been reported thanks to the
use of constitutive open shell transition metal ions within the framework of the structure. More limited,
however, is the number of pure organic porous magnetic materials, mainly because of the limited range
of free organic radicals with enough persistence and stability.