Polarization Dependence of Low-Frequency Vibrations from Multiple Faces in an Organic Single Crystal

Nemtsov, Irena; Aviv, Hagit; Mastai, Yitzhak; Tischler, Yaakov R.

doi:10.3390/cryst9080425

Cited by 7 publications

(8 citation statements)

References 36 publications

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“…Interestingly, the narrow low-frequency Raman shift at 98 cm −1 stems from hydrogen bond stretching, a feature that is normally detected in highly organized structures, such as crystals. [51] The FTIR spectra further support our Raman results. The dominant peaks between 410 and 490 cm −1 were attributed to the presence of ZnO stretching.…”

Section: Growth Study and Characterization Of Zn/cys Thin Filmssupporting

confidence: 81%

Growth of Hybrid Chiral Thin Films by Molecular Layer Deposition Zinc/Cysteine as a Case Study

Yemini

Blanga

Aviv

et al. 2021

Adv Materials Inter

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bio-mimic interfaces with enantioselective properties remains challenging for chemists and materials scientists. For many research areas, such as medicine, biology, and chemistry, achieving enantioselective control is essential because it is a key parameter in molecular recognition. [5][6][7] Hence, the development of advanced methods to synthesize, separate, and detect chiral compounds is of particular importance.Chirality also plays a useful role in many nanosystems, [8] such as chiroptical molecular switches, [9][10][11] molecular motors, chiral surfaces, [12,13] chiral nanoparticles, [14][15][16][17][18][19] and chiral polymeric nanoparticles. [20][21][22] Overall, the areas of chiral nanoscience and nanotechnology hold exceptionally strong promise for further developments in areas such as catalysis, biorecognition, and chiral separation. Chiral mesoporous materials, for example, chiral mesoporous carbon, [23,24] chiral mesoporous silica, [25][26][27] and silica imprinted with different chiral functionalities, [28][29][30][31] are examples of promising nanosystems and have proved to play an important role in many fields of chemistry.One of the most promising chiral nanoscale systems is based on the use of chiral surfaces. Overall, there are three types of chiral surfaces, including surfaces from chiral bulk structures, such as quartz, and some high Miller-index surfaces of achiral crystals. [14] Chiral surfaces can also be produced by templating using chiral ligands and by the adsorption of chiral molecules to form chiral self-assembled monolayers (SAMs). [32][33][34][35] A potentially promising method to produce chiral surfaces is molecular layer deposition (MLD), used in combination with atomic layer deposition (ALD). [36] The A/MLD (atomic/molecular layer deposition) method is based on bifunctional compounds that vaporize, chemisorb, and react with a suitably functionalized surface. Both ALD and MLD allow the temporal separation of any number of precursors, each of which undergoes a self-limiting adsorption/ reaction on the surface so that the typical uptake is limited to approximately one monolayer of any given precursor. The ALD and MLD system is the same. However, the difference between these two is by replacing the small oxidizing precursor (e.g., water, O 3 ) used for ALD with oxidizing organic molecule as the reactant. Therefore, it will grow molecular layer instead of growing atomic layer. This leads to a growth controlled at the Atomic and molecular layer deposition (ALD and MLD) are techniques based on surface-directed self-limiting reactions that afford deposition of films controlled at the monolayer level and with extreme conformality, even on ultra-high-aspect-ratio and porous substrates. These methodologies are typically used to deposit thin films with desirable physical properties and functionality. Here, the MLD process is harnessed to demonstrate the growth of molecularly thin chiral films that inherit a desirable chemical property directly from the source precursor: using this innovative t...

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Section: Growth Study and Characterization Of Zn/cys Thin Filmssupporting

confidence: 81%

Growth of Hybrid Chiral Thin Films by Molecular Layer Deposition Zinc/Cysteine as a Case Study

Yemini

Blanga

Aviv

et al. 2021

Adv Materials Inter

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“…In another study [ 49 ], Tischler et al used low-frequency polarized Raman spectroscopy in order to reveal the molecular orientation of a single organic microcrystal made of the amino acid L-alanine. The Raman spectra at the polarization directions 0°, 45°, and 90° are shown in Figure 2 d, relative to the (101) plane.…”

Section: Polarization-based Measurement Methods For Characterization ...mentioning

confidence: 99%

“…( d ) Polarized Raman spectra of the L-alanine single crystal from the (101) plane in three-beam polarization directions: zero (black), 45 (cyan), and 90 (pink) degrees. The inset shows hydrogen bonds’ simulation relative to the (101) plane [ 49 ], reproduced with permission from Nemtsov, I.; Aviv, H.; Mastai, Y.; Tischler, Y.R., Crystals , published by MDPI, 2019.…”

Section: Figurementioning

confidence: 99%

Optical Polarization-Based Measurement Methods for Characterization of Self-Assembled Peptides’ and Amino Acids’ Micro- and Nanostructures

Handelman

2022

Molecules

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In recent years, self-assembled peptides’ and amino acids’ (SAPA) micro- and nanostructures have gained much research interest. Here, description of how SAPA architectures can be characterized using polarization-based optical measurement methods is provided. The measurement methods discussed include: polarized Raman spectroscopy, polarized imaging microscopy, birefringence imaging, and fluorescence polarization. An example of linear polarized waveguiding in an amino acid Histidine microstructure is discussed. The implementation of a polarization-based measurement method for monitoring peptide self-assembly processes and for deriving molecular orientation of peptides is also described.

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“…Raman spectroscopy is a powerful, fast, and nondestructive experimental technique, which has been extensively applied not only in basic scientific researches, but also for practical applications. It can provide physical, chemical, and structural characteristics of investigated samples [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In the past decade, Raman spectroscopy has been applied for quantitative and qualitative studies of various types of minerals.…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopy Study of Phosphorites Combined with PCA-HCA and OPLS-DA Models

et al. 2019

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Phosphorite is a nonrenewable strategic resource, a convenient and rapid method of phosphorite grade identification and classification is important to improve phosphate utilization. In this study, Raman spectroscopy has been combined with principal component analysis and hierarchical clustering analysis (PCA-HCA) and orthogonal partial least squares-discriminant analysis (OPLS-DA) models for an investigation of different grade phosphorite samples. Both the PCA-HCA and OPLS-DA models showed that different grade phosphorite samples can be clearly distinguished by statistically analyzing the Raman spectra after smoothing, baseline correction, and first derivation. In addition, the S-line study on the OPLS-DA model clearly demonstrated that the symmetrical stretching vibrational mode of phosphate near 960 cm−1 had a much more significant contribution than other vibrational modes for the differentiation of different grade phosphorite samples.

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Polarization Dependence of Low-Frequency Vibrations from Multiple Faces in an Organic Single Crystal

Cited by 7 publications

References 36 publications

Growth of Hybrid Chiral Thin Films by Molecular Layer Deposition Zinc/Cysteine as a Case Study

Growth of Hybrid Chiral Thin Films by Molecular Layer Deposition Zinc/Cysteine as a Case Study

Optical Polarization-Based Measurement Methods for Characterization of Self-Assembled Peptides’ and Amino Acids’ Micro- and Nanostructures

Raman Spectroscopy Study of Phosphorites Combined with PCA-HCA and OPLS-DA Models

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