Optical Properties

Sirdeshmukh, D. B.; Sirdeshmukh, Lalitha; Subhadra, K. G.

doi:10.1007/978-3-662-04341-7_4

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…This corresponds to a ratio of the lattice parameters |b 1 |/|a 1 | = 1.74 ± 0.01. To less than 1%, this ratio is the same as what is known for bulk KCl and Cu at room temperature [79]. Moreover, to the precision of the experiment, the measured ratio verifies the condition |b 1 |/|a 1 | = √ 3 required by Eq.…”

Section: A Ultrathin Kcl Films On Cu(111)supporting

confidence: 80%

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)

Bretel,

Le Moal,

Oughaddou

et al. 2023

Phys. Rev. B

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We report on the growth of one-dimensional (1D) chains of the prochiral quinacridone (QA) molecule on ultrathin KCl films on Cu(111) in ultrahigh vacuum. Using low-temperature scanning tunneling microscopy (STM), we observe straight homochiral 1D chains of QA molecules on one (1L), two (2L), and three (3L) atomic layer thick (100)-terminated KCl islands. The KCl films mostly consist of 2L-thick KCl islands delineated by long polar and short nonpolar edges. These 2L-thick KCl islands are topped by smaller one-atom-thick KCl islands or pits, which are delineated by nonpolar step edges. We find that QA chains can nucleate at these nonpolar step edges or on top of KCl terraces without assistance of step edges. In both cases, the longest straight QA chains observed grow along the KCl 100 directions or slightly rotated (typically less than 10 • ) from them. Intermolecular distances ranging from 6.4 Å to 6.8 Å are measured for QA chains on KCl/Cu(111), which is compatible with hydrogen bonds between neighboring flat-lying QA molecules. These intermolecular distances being larger than the measured KCl lattice parameter (i.e., 6.21 Å at 78 K), QA chain growth on KCl/Cu(111) is incommensurate. Molecular arrangement models for the QA chains on KCl are proposed, based on the analysis of the STM images.

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Section: A Ultrathin Kcl Films On Cu(111)supporting

confidence: 80%

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)

Bretel,

Le Moal,

Oughaddou

et al. 2023

Phys. Rev. B

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“…The lattice constants were measured by counting the maximum possible number of atoms or molecules along a primitive vector direction and measuring the distance between the end points from a line profile. The values were then adjusted by taking into account the known KBr lattice constant of 0.66 nm [25]. By averaging the results from 10 images, the PTCDA lattice constants were determined to be b 1 = 1.24 ± 0.02 nm and b 2 = 1.93 ± 0.02 nm.…”

Section: Resultsmentioning

confidence: 99%

Templated growth of 3,4,9,10-perylenetetracarboxylic dianhydride molecules on a nanostructured insulator

et al. 2007

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Nanometre-scale 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) crystallites were produced by trapping the molecules inside monolayer-deep rectangular pits on an alkali halide surface. Noncontact atomic force microscopy was used to measure the crystallite dimensions and lattice structure with molecular resolution. The molecule-substrate lattice mismatch and island heights, typically three to four PTCDA layers, indicate a stress in the first two layers. One-and two-layer crystallites were only observed in pits with side lengths smaller than 10 nm.

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“…The bond lengths of (MX) s were taken from Sirdeshmukh et al, 24 see Table 1. The relevant heats of formation (298 K) of (MX) s are available from the NIST-JANAF tables 25 and from the NBS database 26 Where they overlap, agreement is good.…”

Section: Reference Data For Solid-phase Alkali Halidesmentioning

confidence: 99%

Estimation of thermodynamic and physicochemical properties of the alkali astatides: On the bond strength of molecular astatine (At₂) and the hydration enthalpy of astatide (At⁻)

Burgers,

Zeneyedpour,

Luider

et al. 2024

J Mass Spectrom

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The recent accurate and precise determination of the electron affinity (EA) of the astatine atom At0 warrants a re‐investigation of the estimated thermodynamic properties of At0 and astatine containing molecules as this EA was found to be much lower (by 0.4 eV) than previous estimated values. In this contribution we estimate, from available data sources, the following thermodynamic and physicochemical properties of the alkali astatides (MAt, M = Li, Na, K, Rb, Cs): their solid and gaseous heats of formation, lattice and gas‐phase binding enthalpies, sublimation energies and melting temperatures. Gas‐phase charge‐transfer dissociation energies for the alkali astatides (the energy requirement for M+At− ➔ M0 + At0) have been obtained and are compared with those for the other alkali halides. Use of Born‐Haber cycles together with the new AE (At0) value allows the re‐evaluation of ΔHf (At0)g (=56 ± 5 kJ/mol); it is concluded that (At2)g is a weakly bonded species (bond strength <50 kJ/mol), significantly weaker bonded than previously estimated (116 kJ/mol) and much weaker bonded than I2 (148 kJ/mol), but in agreement with the finding from theory that spin‐orbit coupling considerably reduces the bond strength in At2. The hydration enthalpy (ΔHaq) of At− is estimated to be −230 ± 2 kJ/mol (using ΔHaq[H+] = −1150.1 kJ/mol), in good agreement with molecular dynamics calculations. Arguments are presented that the largest alkali halide, CsAt, like the smallest, LiF, will be only sparingly soluble in water, following the generalization from hard/soft acid/base principles that “small likes small” and “large likes large.”

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Optical Properties

Cited by 4 publications

References 32 publications

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)

Templated growth of 3,4,9,10-perylenetetracarboxylic dianhydride molecules on a nanostructured insulator

Estimation of thermodynamic and physicochemical properties of the alkali astatides: On the bond strength of molecular astatine (At₂) and the hydration enthalpy of astatide (At⁻)

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Optical Properties

Cited by 4 publications

References 32 publications

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)

Hydrogen-bonded one-dimensional molecular chains on ultrathin insulating films: Quinacridone on KCl/Cu(111)

Templated growth of 3,4,9,10-perylenetetracarboxylic dianhydride molecules on a nanostructured insulator

Estimation of thermodynamic and physicochemical properties of the alkali astatides: On the bond strength of molecular astatine (At2) and the hydration enthalpy of astatide (At−)

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Estimation of thermodynamic and physicochemical properties of the alkali astatides: On the bond strength of molecular astatine (At₂) and the hydration enthalpy of astatide (At⁻)