Tuning the arrangement of mono-crown ether-substituted phthalocyanines in Langmuir–Blodgett films by the length of alkyl chains and the cation in subphase

(Pc)Eu(Pc)Eu[trans-T(COOCH3)2PP]/GO Hybrid Film-Based Nonenzymatic H2O2 Electrochemical Sensor with Excellent Performance

“…Consequently, the orientation angle between the tetrapyrrole ring of 1 and substrate surface was estimated to be ca. 43.7° (Figures C), corresponding well with the UV–vis and polarized UV–vis spectroscopic results and confirming the formation of J aggregates with an “edge-on” conformation of the molecules of 1 in the QLS film. ,, In addition, a higher-order diffraction observed at 2θ = 28.72° ( d = 0.31 nm) for the pure triple-decker QLS film is assigned to the stacking distance among tetrapyrrole rings of triple-decker molecules with face-on orientation (Figure C). − In the XRD pattern of the triple-decker/GO hybrid film shown in Figure B, observation of two peaks at 2θ = 6.22° ( d = 1.45 nm) and 2θ = 10.06° ( d = 0.89 nm) corresponding to the (001) lattice planes of the triple-decker and GO layers, respectively, suggests the regular layered structure and the same molecular stacking structure employed by the triple-decker molecules and GO in the hybrid film as in corresponding single-component films. The fact that only the (00l) diffraction peak of triple-decker is observed, in combination with the lack of the stacking peak in the OOP XRD diagram of the hybrid film, suggests the identical edge-on orientation employed by the triple-decker molecules on the substrate (Figure C). ,, Actually, the hybrid film XRD pattern also shows an additional diffraction at 0.25 nm, which is attributed to the intermolecular hydrogen bonding formed between the carbonyl groups of the molecules of 1 and hydroxyl/carboxyl groups of GO .…”

“…43.7°(Figures 3C), corresponding well with the UV−vis and polarized UV−vis spectroscopic results and confirming the formation of J aggregates with an "edge-on" conformation of the molecules of 1 in the QLS film. 39,49,51 In addition, a higher-order diffraction observed at 2θ = 28.72°(d = 0.31 nm) for the pure triple-decker QLS film is assigned to the stacking distance among tetrapyrrole rings of triple-decker molecules with faceon orientation (Figure 3C). 52−54 In the XRD pattern of the triple-decker/GO hybrid film shown in Figure 3B, observation of two peaks at 2θ = 6.22°(d = 1.45 nm) and 2θ = 10.06°(d = 0.89 nm) corresponding to the (001) lattice planes of the triple-decker and GO layers, respectively, suggests the regular layered structure and the same molecular stacking structure employed by the triple-decker molecules and GO in the hybrid film as in corresponding single-component films.…”

Spin Crossover in Nickel(II) Tetraphenylporphyrinate via Forced Axial Coordination at the Air/Water Interface

“…Considering the fact that CRPcRu(pyz) 2 bears two axial pyrazine ligands, which are quite hydrophilic, face-on orientation of the molecule is most likely. The observed discrepancy between the experimental molecular area and the theoretical one is commonly explained by hydrophilic and labile nature of the crown-ether moieties, which can be partially immersed into the aqueous subphase and/or deformed slightly in the monolayer [ 36 , 37 , 38 , 39 ].…”

The optical characterization of metal-mediated aggregation behaviour of amphiphilic Zn(ii) phthalocyanines

“…A split Q-band was previously observed in amphiphilic phthalocyanine LB films and attributed to a special aggregated form called ''herring-bone'' aggregation. [51][52][53] In herring-bone type aggregates, alternating stacks of phthalocyanine molecules are oriented at a certain angle with respect to each other. 2D confinement of the columnar Pc stacks of both 3 and 4 under an applied surface pressure may cause herring-bone type aggregates at the air/water interface which can then be transferred onto glass substrates.…”