FT-IR, FT-Raman, and DFT computational studies of melaminium nitrate molecular–ionic crystal

Tanak, Hasan; Marchewka, M.K.

doi:10.1016/j.molstruc.2012.10.046

Cited by 34 publications

(6 citation statements)

References 43 publications

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“…The FTIR peaks between 1500 and 1800 cm −1 are related to the CN band and can be assigned from the literature. 40,41 In Figure 2a, the CN stretching vibration in FAI is shifted from 1692 to 1716 cm −1 , whereas the CN stretching within a 1,3,5-triazine skeleton of melaminium iodide is shifted from 1501 to 1496 cm −1 upon formation of the MI•FAI complex. This indicates that the C N bond in FAI is strengthened but that in melaminium iodide is weakened, which evidences interaction between the amine group in FAI and the cyano group in melaminium iodide via hydrogen bonding.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The white precipitate was filtered, dried under vacuum for 24 h, and then stored in a glove box filled with Ar. Melaminium iodide was synthesized by modification of the method from reported literature procedures. , 1.26 g (0.01 mol) of melamine (99%, Alfa Aesar) was dissolved in aqueous hydroiodic acid (2.5 g of hydroiodic acid (57 wt % aqueous solution, Aldrich) was added to 25 mL H 2 O) and stirred at 45 °C for 12 h. The precipitate was collected after evaporating the solvent and washed with diethyl ether (melaminium iodide color was pale yellow). The precipitate was filtered, dried under vacuum for 24 h, and stored in a glove box filled with Ar.…”

Section: Methodsmentioning

confidence: 99%

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Rear-Surface Passivation by Melaminium Iodide Additive for Stable and Hysteresis-less Perovskite Solar Cells

Kim

Chen

Seo

et al. 2018

ACS Appl. Mater. Interfaces

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Surface passivation of perovskite grains is one of the promising methods to reduce recombination and improve stability of perovskite solar cells (PSCs). We herein report the effect of a melaminium iodide additive on the photovoltaic performance of PSCs based on (FAPbI)(CsPbBr) perovskite. Cyclic -C═N- and primary amine in melamine are a good hydrogen bond acceptor and Lewis base, which can interact with both the organic cation and Lewis acidic lead iodide in the perovskite film. Melaminium iodide is synthesized and added to the precursor solution, which is directly spin-coated to form the perovskite film. The presence of melaminium iodide additive reduces the trap density from 1.02 × 10 to 0.645 × 10 cm, which leads to the reduction of nonradiative recombination and thereby improving the mean open-circuit voltage and the fill factor from 1.054 to 1.095 V and from 0.693 to 0.725 V, receptively. In addition, photocurrent-voltage hysteresis is reduced by the melaminium iodide additive, which results in an enhanced average power conversion efficiency, obtained from reverse and forward scanned data, from 15.86 to 17.32%. Time-resolved photoluminescence confirms that melaminium iodide plays a more important role in passivating the rear surface of the perovskite layer contacting the hole transporting spiro-MeOTAD layer. An aging test under a relative humidity of 65% reveals that melaminium iodide improves stability because of the suppression of the defect evolved by moisture.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Rear-Surface Passivation by Melaminium Iodide Additive for Stable and Hysteresis-less Perovskite Solar Cells

Kim

Chen

Seo

et al. 2018

ACS Appl. Mater. Interfaces

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“…According to the previous studies, when melamine binds with boric acid or protonated melamine binds with some oxygen-containing acidic ions to form melaminium salts, a ring structure is formed through two hydrogen bonds between the triazine ring of melamine and acid molecules. Such an interaction leads to an extra and strong IR characteristic peak at 1680 cm –1 or higher wavenumber, which is attributed to a blue-shifted NH 2 deformation vibration from 1629 cm –1 . − Since a similar hydrogen bonding pattern exists in the T–melamine–T structure (Figure a), we preliminarily ascribe this new band to the blue-shifted NH 2 deformation vibration induced by the hydrogen bonding interaction. To further investigate the origin of this new PAEIR peak, cytosine was added to the T36 DNA SAM modified antenna at the same concentration as melamine.…”

mentioning

confidence: 92%

Revealing the Hydrogen Bonding Interaction of DNA with Unnatural Bases via Plasmonic Antenna Enhanced Infrared Spectroscopy

Yan

et al. 2021

J. Phys. Chem. Lett.

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The incorporation of unnatural bases in DNA programming can break through the limits of Watson–Crick and Hoogsteen base pairing to expand the diversity of DNA structures. Thus, understanding the interaction between DNA and unnatural bases is of great importance in DNA nanotechnology. Here, we propose an approach of plasmonic antenna enhanced infrared spectroscopy to study the hydrogen bonding interaction between poly(thymine) DNA (poly T DNA) and melamine. The formation of multiple hydrogen bonds between melamine and thymine of poly T DNA is revealed by the appearance of a new infrared (IR) feature of the NH2 deformation vibration at 1680 cm–1. The binding rate constant (k b) and the dissociation rate constant (k d) of the affinity reaction reach 39.70 M–1·s–1 and 4.49 × 10–5 s–1, respectively. This work offers a valuable IR technique to study DNA nanostructures at the molecular level, providing unique physicochemical views of the interaction mechanism between DNA and unnatural bases in DNA programming.

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“…The characteristic stretching band appearing at around 2232 cm −1 suggested that the nitrile groups existed in the polymer [26]. Most importantly, a new characteristic absorption band appearing at 1685 cm −1 in PEN–OH with heat-treatment was assigned to the stretching vibration of –C=N– [27], indicating the formation of triazine ring, which provided supports for the cross-linking reactions among the PEN–OH.…”

Section: Resultsmentioning

confidence: 99%

Self-Toughening and Self-Enhancement Poly(arylene ether nitrile) with Low Dielectric Constant by Solid Crosslinking Reaction

et al. 2019

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A novel poly(arylene ether nitrile) terminated with hydroxyl groups (PEN–OH) was synthesized successfully. The effects of heat-treatment temperature on the thermal properties, mechanical properties, and dielectric properties of the PEN–OH films were studied in detail. Due to the cross-linking reaction occurring, at high temperature, among the nitrile groups on the side of the PEN–OH main chain to form a structurally stable triazine ring, the structure of materials changes from a linear structure to a bulk structure. Thus, the thermal properties and mechanical properties were improved. In addition, the occurrence of cross-linking reactions can reduce the polar groups in the material, leading to the decrease of dielectric constant. As the heat-treatment temperature increased, the glass-transition temperature increased from 180.6 °C to 203.6 °C, and the dielectric constant decreased from 3.4 to 2.8 at 1 MHz. Proper temperature heat-treatment could improve the tensile strength, as well as the elongation, at the break of the PEN–OH films. Moreover, because of the excellent adhesive property of PEN–OH to copper foil, a double-layer flexible copper clad laminate (FCCL) without any adhesives based on PEN–OH was prepared by a simple hot-press method, which possessed high peel strength with 1.01 N/mm. Therefore, the PEN–OH has potential applications in the electronic field.

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FT-IR, FT-Raman, and DFT computational studies of melaminium nitrate molecular–ionic crystal

Cited by 34 publications

References 43 publications

Rear-Surface Passivation by Melaminium Iodide Additive for Stable and Hysteresis-less Perovskite Solar Cells

Rear-Surface Passivation by Melaminium Iodide Additive for Stable and Hysteresis-less Perovskite Solar Cells

Revealing the Hydrogen Bonding Interaction of DNA with Unnatural Bases via Plasmonic Antenna Enhanced Infrared Spectroscopy

Self-Toughening and Self-Enhancement Poly(arylene ether nitrile) with Low Dielectric Constant by Solid Crosslinking Reaction

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