Fluorosubstituted lead phthalocyanines: Crystal structure, spectral and sensing properties. (February 2020)

• Record Type: Journal Article
• Authors: Kuprikova, Natalia M.; Klyamer, Darya D.; Sukhikh, Aleksandr S.; Krasnov, Pavel O.; Mrsic, Ivana; Basova, Tamara V.
• Is Part Of: Dyes and pigments. Volume 173(2020)
• Publication Date: 2020-02
• Subjects: Lead phthalocyanines -- Thin films -- Crystal structure -- Spectra -- Chemiresistive sensors; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2019.107939
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: In this work, we synthesized and investigated tetra- (PbPcF4 ) and hexadecafluorinated (PbPcF16 ) lead phthalocyanines. Their single crystal structures were refined for the first time. PbPcF4 crystallizes in stacks with all molecules facing in one direction identically to the monoclinic PbPc polymorph in the tetragonal space group I4, while PbPcF16 crystallizes in the triclinic P-1 space group. Moreover, the effect of fluorosubstitution on the structural features of thin films grown by organic molecular beam deposition (OMBD), vibrational and UV–visible optical absorption spectra is discussed. Apart from this, the chemiresistive sensor response of PbPcFx (x = 0, 4, 16) films to ammonia (1–5 ppm) in dependence on fluorination degree is also studied. It was shown that the sensor response to ammonia decreases in the order of PbPcF4 > PbPcF16 > PbPc. The nature of interaction between PbPcFx and ammonia molecules was studied using DFT calculations. Graphical abstract: Image 1 Highlights: Fluorinated lead phthalocyanines were synthesized and investigated. Single crystal structures of fluorinated lead phthalocyanines were refined. Effect of fluorosubstitution on the spectral properties was studied. Structure of thin films depends on the number of fluorine substituents. Tetrafluorosubstituted lead phthalocyanine has maximal sensor response to ammonia.