Electrochromism in the transition-metal phthalocyanines. Part 2.—Structural changes in and properties of [Cr(pc)] and [Mn(pc)] films

Silver, Jack; Lukes, Peter J.; Hey, Paul; Ahmet, Mustafa T.

doi:10.1039/jm9920200841

Cited by 32 publications

(13 citation statements)

References 24 publications

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“…Thus, only a few sensors have shown enough sensitivity and selectivity for the detection of silver(I) and palladium(II). 2,15,[20][21][22] The complete understanding of the redox behaviour of MPcs, which have a redox-active metal center (M = metal ion), is very important and closely related to the applications of these structures in various technological areas, such as electrocatalysis [23][24][25] and electrochromism. 26,27 In most cases, it is not possible to understand the redox behaviour of MPcs completely by using classical electrochemistry alone.…”

Section: Introductionmentioning

confidence: 99%

Highly selective thioalcohol modified phthalocyanine sensors for Ag(i) and Pd(ii) based on target induced J- and H-type aggregations: synthesis, electrochemistry and peripheral metal ion binding studies

et al. 2012

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We have described highly selective 1(4),8(11),15(18),22(25)-(1-hydroxyhexan-3-ylthio)-phthalocyanine sensors, M{Pc[α-SCH(C(3)H(7))(C(2)H(5)OH)](4)} (MPc(α-HHT)(4), where M = Zn(II) (2), Cu(II) (3) or Co(II) (4) and HHT: -SCH(C(3)H(7))(C(2)H(5)OH)). The formation of S-M-S {S = sulfur; M = Ag(I) or Pd(II)} bonds on the periphery in the case of Ag(I) and Pd(II) metal ions induces H- or J-aggregation, respectively, which results in significant changes in the absorption of the B- and, in particular, the Q-band. The binding ratios of Ag(I) to the periphery of 2 and 3 were found to be ca. 2:1 and 3:2, respectively. On the other hand, the binding ratios of Pd(II) to the periphery of the same compounds were found to be 3:1 and 4:1. The fluorescence of 2 exhibited distinct changes in response to treatment with Ag(I) and Pd(II) ions in solution. The fluorescence spectra emission intensity of 2 was quenched upon titration with Ag(I) and Pd(II) and a new emission maximum was observed upon titration with Pd(II). FTIR, (1)H-NMR, (13)C-NMR, UV-vis, MALDI-TOF MS and elemental analysis data were used to characterize the novel compounds. Transmission electron microscopy (TEM) and field-emission scanning electron microscopy (FE-SEM) were also used as complementary techniques to investigate the morphology and to image the interfacial aggregates of 2. The redox behaviours of the complexes were examined by voltammetry and in situ spectroelectrochemistry on Pt in a nonaqueous medium.

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Section: Introductionmentioning

confidence: 99%

Highly selective thioalcohol modified phthalocyanine sensors for Ag(i) and Pd(ii) based on target induced J- and H-type aggregations: synthesis, electrochemistry and peripheral metal ion binding studies

et al. 2012

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“…This type of overpotential, as compared to the peak position on all subsequent scans, was often observed in the various thinfilm samples, and was recognized as a memory effect, [22] caused by an irreversible penetration of counterions into the film for charge balancing, a surface process such as film restructuring, and/or surface resistance change during the first CV cycle. [9][10][11] In the oxidation scans, on the other hand, an oxidation peak always appeared at 0.05 V.…”

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confidence: 95%

“…[1,6,7] Electrochromism of MPc thin films has also been studied extensively. [8][9][10][11] Accordingly, it is important to develop fabrication techniques for these thin films and to elucidate their chemical and physical properties, in addition to performing fundamental studies on the bulk crystals.…”

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confidence: 99%

Electrochromism and Stable n‐Type Doping of Highly Oriented Thin Films of Tetrakis(thiadiazole)porphyrazine

et al. 2007

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“…It was shown that thin films of chromium phthalocyanine (CrPc) could be deposited using vacuum deposition techniques, but they were not stable in air and oxidized to Cr(OH)Pc. [8] However, Ercolani et al [9] reported that α-polymorph of CrPc was stable in air. Since it is well known that other metal phthalocyanines such as CoPc [10,11] and ZnPc [12,13] are deposited onto substrate surface as α-polymorphs, it is suggested that air stable CrPc thin films can be obtained if CrPc is deposited onto the substrate surface as α-polymorph.…”

Section: Introductionmentioning

confidence: 99%

X-Ray Diffraction Study of Crystal Structure and Thin Films of Chromium(II) Phthalocyaninate

Sukhikh¹,

Klyamer²,

Basova³

2020

MHC

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Crystal structure of Cr(II) phthalocyaninate (CrPc) was determined by means of single-crystal X-ray diffraction. It was shown that after vacuum sublimation CrPc crystallized as a β-polymorph, which was isostructural to β-polymorphs of other metal phthalocyanines. When deposited onto glass substrate by organic molecular beam deposition, CrPc formed thin films with strong preferred orientation, consisting of α-polymorph. It was shown that both β-CrPc powder and α-CrPc films were unstable in air and transformed to Cr(OH)Pc. X-Ray diffraction (XRD) studies showed that β-CrPc polycrystalline powder after storage in air (relative humidity 20 %) began to exhibit the first signs of degradation already in 1 hour, while the first changes in XRD patterns of α-CrPc films became noticeable only after a few days. Annealing of α-CrPc films at 250 °C in air at a relative humidity of 70 % leads to their faster conversion to Cr(OH)Pc, and the resulting films have a high degree of crystallinity.

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Electrochromism in the transition-metal phthalocyanines. Part 2.—Structural changes in and properties of [Cr(pc)] and [Mn(pc)] films

Cited by 32 publications

References 24 publications

Highly selective thioalcohol modified phthalocyanine sensors for Ag(i) and Pd(ii) based on target induced J- and H-type aggregations: synthesis, electrochemistry and peripheral metal ion binding studies

Highly selective thioalcohol modified phthalocyanine sensors for Ag(i) and Pd(ii) based on target induced J- and H-type aggregations: synthesis, electrochemistry and peripheral metal ion binding studies

Electrochromism and Stable n‐Type Doping of Highly Oriented Thin Films of Tetrakis(thiadiazole)porphyrazine

X-Ray Diffraction Study of Crystal Structure and Thin Films of Chromium(II) Phthalocyaninate

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