2D host–guest supramolecular chemistry for an on-monolayer graphene emitting platform

Abstract

Here, is reported a novel strategy of non-covalent functionalization of graphene to avoid the electronic coupling between this semi-metal and directly adsorbed optically active molecules. Graphene-confined supramolecular host-guest recognition is...

Giant Photo‐Magneto‐Thermoelectric Effect of End‐On Oriented PEDOT Grown from Self‐Assembled 3D Tectons

“…The surface ordering of the adlayers was examined according to the previous reports. [ 30,31 ] Raman spectroscopy was performed for the functionalized graphene surface with 532 and 325 nm laser excitation under ambient conditions (Figure 1d and Figure S5, Supporting Information), respectively, and five characteristic peaks were obtained from G3D. The Raman shift of 4 peaks was similar to those of G1 and ZnPc except for one peak at ≈1420 cm −1 , which may be ascribable to EDOT‐Py (Figure S5a, Supporting Information).…”

“…Complexation of ZnPc with EDOT‐Py was examined using excess EDOT‐Py in toluene according to the reported method on the perylene tetracarboxydiimide (PTCDI) complex. [ 31 ] As shown in the UV‐Vis spectra, the absorbance at 300 nm sharply increased as the EDOT content was increased, while intensity of the Q‐band for ZnPc at 672 nm slightly decreased (0.2% for ZnPc:EDOT‐Py = 1:100) (Figure S4a, Supporting Information). The shift in the Q‐band achieved by increasing the EDOT‐Py content was small (1 nm redshift), which matched the previous result obtained for M‐Py (M = maleimide‐Py and PTCDI) complexed with ZnPc.…”

“…Then, EDOT‐Py complexed with ZnPc assemblies was immobilized into the hexagonal nanopore array of TSBs on graphene (G3D), similar to the method reported for the ZnPc:PTCDI complex on G1. [ 31 ] The diameter of the nanopore of G1 corresponds to ≈1.9 nm; thus, each ZnPc molecule with an ≈1.5 nm diameter [ 30 ] can be selectively absorbed by the pore, in which EDOT‐Py complexed perpendicular to the ZnPc molecule (Figure 1a–c). To examine the effect of the ZnPc:EDOT‐Py complex filling the nanopores made by TSBs, reference samples were prepared; the same amount of EDOT‐Py (based on molecular calculation) was deposited on G1 and abbreviated as G2 (Figure S3, Supporting Information).…”

“…The shift in the Q-band achieved by increasing the EDOT-Py content was small (1 nm redshift), which matched the previous result obtained for M-Py (M = maleimide-Py and PTCDI) complexed with ZnPc. [30,31] The shifted peak was saturated at 100 equivalents of EDOT-Py to ZnPc. The spectral shift of ZnPc upon complexation with EDOT-Py was confirmed by TD-DFT calculations with the B3LYP functional using the 6-31G(d,p) basis set in toluene (details in the Supporting Information).…”

From molecules in solution to molecules on surfaces – using supramolecular dyads to form functional self-assembled networks on graphene

“…21 To address this problem, a strategy based on functional self-assembling molecules (dyads) that combine an optically active component with a graphene-binding pedestal was proposed, supported by preliminary observations. 22 In this report, a single system composed of a zinc phthalocyanine (ZnPc) associated to a perylenetetracarboxylic diimide (PDI) chromophore was studied by STM and confocal spectroscopy, with the aim to obtain an emitting 2D-network on a graphene substrate. This work demonstrates the feasibility of the strategy through their computational studies, demonstrating that the metal–ligand interaction occurs.…”