Conformation and orientation of alkyl chains in the layered organic–inorganic hybrids: (CnH2n+1NH3)2PbI4(n = 12,16,18)

Venkataraman, N. V.; Bhagyalakshmi, S; Vasudevan, S.; Seshadri, Ram

doi:10.1039/b204983j

Cited by 71 publications

(98 citation statements)

References 36 publications

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“…The occurrence of such a progression is widely accepted as being diagnostic of all-trans conformational order, and is used for that purpose [51,52].…”

Section: The Ch 2 Wagging Progressionmentioning

confidence: 99%

FTIR spectroscopy of synthesized racemic nonacosan-10-ol: a model compound for plant epicuticular waxes

Coward

2010

J Biol Phys

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As there are no published graphically presented, detailed IR spectra of nonacosan-10-ol (occurring naturally and widely in plant epicuticular waxes of nanotube form), near IR FTIR spectroscopy (fundamentals, overtones and combinations) has been performed on laboratory synthesized racemic nonacosan-10-ol, as a crystalline solid on Mylar, and polypropylene substrates. Room temperature, in vacuo data are presented graphically, in full, and show evidence of extensive hydrogen bonding, an orthorhombic perpendicular subcell, a methylene wagging progression, diagnostic of all-trans conformational order, and Fermi resonance. Moderate or stronger anharmonicity is confirmed. Detailed discussion, quantitative in parts, is given of the observed spectral features, especially as to how they inform crystal structure and molecular conformation, and assignments given for some of the features. The results will serve as a reference for future IR studies of the natural epicuticular wax nanotube form of (S)-nonacosan-10-ol.

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“…The occurrence of such a progression is widely accepted as being diagnostic of all-trans conformational order, and is used for that purpose [51,52].…”

Section: The Ch 2 Wagging Progressionmentioning

confidence: 99%

FTIR spectroscopy of synthesized racemic nonacosan-10-ol: a model compound for plant epicuticular waxes

Coward

2010

J Biol Phys

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“…The possibility of a preferential distribution of C atoms (i.e., alkyl chains) at the surface of the micro-objects formed to account for the hydrophobic character was discarded on the basis of the X-ray mapping data ( Figure S4). This result strongly suggests that the high θ value of A should be associated 45 with the roughness of the surface topography of the sample.…”

Section: Resultsmentioning

confidence: 77%

“…Although both terms refer to mechanisms generating collective order from small-scale interactions, they may be distinguished on the basis of thermodynamic arguments. 14 Self-assembly concerns non-dissipative structural order on a 45 macroscopic level owing to collective interactions between multiple components (often microscopic) which retain their character when integrated in the self-assembled structure. 14,15 Self-assembly is a spontaneous process, since the energy of the components is higher than that of the self-assembled structure, 50 which is in static equilibrium and remains as such in the absence of energy input.…”

Section: Methodsmentioning

confidence: 99%

“…Coupling constants (J values) are reported in Hertz (Hz). 45 29 Si MAS and 13 C CP/MAS NMR spectra were recorded on a Bruker Avance 400 (9.4 T) spectrometer at 79.49 and 100.62 MHz, respectively. 29 Si MAS NMR spectra were recorded with 2 µσ (θ ≈30 ) rf pulses, and recycle delay of 60 s and at a 5.0 kHz spinning rate.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Figure 5a shows the room-temperature emission spectra of A under different excitation wavelengths. All the spectra are composed of a broad band (fwhm, ≈ 140 nm) peaking at 460 nm for excitation wavelengths between 250 and 330 nm and deviates 45 towards the red (from 470 to 595 nm) as the excitation wavelength increases from 370 to 440 nm, respectively. Such emission features resemble those previously reported for m-A (14) 27 (see circles in Figure 5a) and other amorphous analogous hybrids, being attributed to the overlap between two components: 50 one ascribed to the presence of electron-recombination that occur in oxygen related defects within the siliceous backbone and within the amide cross linkages.…”

Section: 40mentioning

confidence: 99%

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Fractality and metastability of a complex amide cross-linked dipodal alkyl/siloxane hybrid

Nunes

Ferreira

et al. 2014

RSC Adv.

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A novel room-temperature white light emitter amide-cross linked alkyl/siloxane hybrid material (amidosil A) was produced by selforganization through the rational design of the precursor. This hybrid displays a highly complex hierarchical architecture composed of two lamellar bilayer structures, the relative spatial arrangement of which yields a multiplicity of ordered nanodomains with variable shapes and sizes, some of them persisting at the microscale. Macroscopically A was obtained as clusters of hydrophobic hemispherical 10 and spherical micro-objects exhibiting a lettuce coral-like pattern, which represent unprecedented pieces of evidence illustrating the principles of self-similarity and demonstrating that the time scale of biomimetic morphogenesis in this non-bridged silsesquioxane is similar to that in biological systems. Heating metastable A above the order/disorder phase transition acted as an external quake driving the material to another metastable state, which has persisted for more than 12 months, and was manifested as a marked change of all the macroscopic properties. The occurrence of the self-organization process operating on A, instead of a self-directed assembly, is primarily 15 associated with the formation/rupture of hydrogen bonds, therefore supporting that these interactions are critical factors dictating on what side of the self-assembly/self-organization boundary will a non-bridged silsesquioxane system evolve.

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Aggregation‐Induced Emission Features of Organometal Halide Perovskites and Their Fluorescence Probe Applications

Niu

Zhang

Bai

et al. 2014

Advanced Optical Materials

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Organometal hybrid perovskites exhibit tunable absorption and photoluminescence spectra that originate from the adjustable excitons of the self-assembled quantum-well structures. The aggregation-induced emission (AIE) features of (RNH 3 ) 2 PbI 4 (R = alkyl, C n H 2 n +1 , n = 4, 12, 16, 18) as well as their reversible photoluminescence response to pH value are demonstrated. This interesting phenomenon correlates with the formation of quantum-well structure, which is a novel AIE mechanism. The temperature sensors based on organometal hybrid perovskites are also investigated. The combination of high sensitivity (1.3% K −1 ) and good reversibility (>500 cycles) of organometal halide perovskites to temperature in a large temperature range (0-80 °C) makes them to be versatile systems for the temperature sensor applications. Furthermore, as a proof of concept, the application of organometal hybrid perovskites in 2D spatial imaging and NIR light detection is also presented.

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Conformation and orientation of alkyl chains in the layered organic–inorganic hybrids: (C_nH_2n+1NH₃)₂PbI₄(n = 12,16,18)

Cited by 71 publications

References 36 publications

FTIR spectroscopy of synthesized racemic nonacosan-10-ol: a model compound for plant epicuticular waxes

FTIR spectroscopy of synthesized racemic nonacosan-10-ol: a model compound for plant epicuticular waxes

Fractality and metastability of a complex amide cross-linked dipodal alkyl/siloxane hybrid

Aggregation‐Induced Emission Features of Organometal Halide Perovskites and Their Fluorescence Probe Applications

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