Supramolecular networks with electron transfer in two dimensions
Organic charge-transfer (CT) co-crystals in a crossed stack system are disclosed. The co-crystals exhibit bidirectional charge transfer interactions where one donor molecule shares electrons with two different acceptors, one acceptor face-to-face and the other edge-to-face. The assembly and charge transfer interaction results in a pleochroic material whereby the optical absorption continuously changes depending on the polarization angle of incident light.
1. An organic charge-transfer (CT) co-crystal in a crossed stack lattice exhibiting bidirectional CT interactions, where one donor molecule shares electrons with two different acceptors; wherein one acceptor is face-to-face with the donor and a second acceptor is edge-to-face with the donor, and wherein the co-crystal exhibits visible pleochroism with RGB and CMYK colors, said organic CT co-crystal selected from the group consisting of
and
2. The organic CT co-crystal according to claim 1 , wherein the acceptor is a diimide.
3. The organic CT co-crystal according to claim 1 , wherein the ionicity of
and
are ρ ms =0.53, ρ xs =0.47, and ρ ms =0.57, ρ xs , =0.42, respectively.
4. The organic CT co-crystal according to claim 1 , wherein the co-crystal violates the mutual exclusion rule of IR and Raman modes along a mixed stack axes and a crossed stack axes.
5. The organic CT co-crystal according to claim 1 , wherein absorption of light of the co-crystal is anisotropic.
6. The organic CT co-crystal according to claim 5 , wherein two distinct chromophores are observed.
7. The organic CT co-crystal according to claim 6 , wherein the two distinct chromophores absorb light at 53° and 95° with absorption maxima at 475 nm and 527 nm, respectively.
8. The organic CT co-crystal according to claim 6 , wherein the two distinct chromophores absorb light at 89° and 117° with absorption maxima at 490 nm and 595 nm, respectively.