Structure of lead phthalocyanine (triclinic form)

Abstract

The crystal structure of the triclinic form of lead phthalocyanine has been determined. The crystal data are: C32HI6NsPb, M r = 719.7, Pi, a = 13.123 (7) The final R value is 0.059 for 7683 reflections. Two independent molecular columns exist in this crystal, but they have almost equivalent structures. The molecules are considerably distorted from C4v symmetry. The central Pb atom significantly deviates from the convex side of the phthalocyanine skeleton, and this deviation is larger than that in the monoclinic form of lead phthalocyanine. Molecules are stacked along the a axis and oriented so that their convex sides alternate. They are considerably inclined with respect to the stacking axis.

Packing Motifs and Magneto‐Structural Correlations in Crystal Structures of Metallo‐Tetrakis(1,2,5‐thiadiazole)porphyrazine Series, MTTDPz (M=H2, Fe, Co, Ni, Cu, Zn)

“…The Zn ion is located above the porphyrazine plane by 0.394(3) , in contrast to the planar molecular structures of the other two. A similar displacement of the center metal ion out of the molecular plane has been observed in other metallophthalocyanines such as PbPc, [16] SnPc, [17] and ZnPcX (X = amine, halogen, or other group). [18] The Pb and Sn ions are located above the molecular plane by 1.28 and 1.13 , respectively, probably reflecting their large ionic radii.…”

Preparation, characterization and gas sensing properties of lead tetra-(tert-butyl)-5,10,15,20-tetraazaporphyrin spin-coating films

“…Thus the resistance of the molecules decreases and the response of the film increases [12]. Structure studies have shown that PbPc [27] and PbNc [28] molecules are not planar, and that the Pb atom is significantly out of the molecular plane containing the macrocycle of C and N atoms. The structure of PbTAP(t-Bu) 4 molecule is similar to those of PbPc and PbNc molecules, which are not planar.…”

Enhanced performance of PbPc photosensitive organic field effect transistors by inserting different-thickness pentacene inducing layers

“…As a widely used organic NIR photosensitive material, PbPc, has drawn intense interest in organic solar cells and organic photodetectors. It is known, PbPc molecule has two kinds of crystal structures, i.e., monoclinic and triclinic [17,18] phase has higher crystallinity than the monoclinic [19]. Moreover, PbPc film usually displays two optical absorption peaks in the red and NIR regions, and the NIR absorption of the triclinic phase is stronger than the monoclinic [15].…”