相关实验视频

Updated: Jan 6, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

对含有1-纳非基的甲基和亚基碳酸进行光物理研究

Rachel A Harder¹, Thomas D McGurrell¹, J A Hugh MacBride¹

¹Department of Chemistry, Durham University, Lower Mountjoy, Stockton Road, Durham DH1 3LE, UK. m.a.fox@durham.ac.uk.

Dalton transactions (Cambridge, England : 2003)

|October 16, 2025

概括

四种新的碳衍生物在溶液和固态中呈现出高能量排放. 它们独特的结构影响光物理性质,表明材料科学中各种应用的潜力.

科学领域:

有机金属化学有机金属化学
光物理学的光学物理学
材料科学材料科学材料科学

背景情况:

碳酸是一种独特的有机化合物类别,具有多样化的应用.
纳基替代碳酸因其光发光特性而引起人们的兴趣.
了解结构属性关系对于设计新的功能材料至关重要.

研究的目的:

合成和表征新型纳替代甲和碳酸.
为了研究这些carboranes在溶液和固态中的光物理性质 (发射光谱,量子产量,寿命).
阐明分子结构与观察到的发光特性之间的关系.

主要方法:

合成了四种新的碳酸衍生物:C-(1-纳) -甲基,C,C'-bis(1-纳) -甲基,C-(1-纳) -对,以及C,C'-bis(1-纳) -对碳酸.
光物理测量包括吸收和发射光谱,量子产量测定,以及在脱气环素溶液和PMMA薄膜中的寿命测量.
混合密度功能理论 (DFT) 振动计算来模拟实验光谱和预测激发状态几何.

主要成果:

合成的碳酸在环中显示出高能量排放 (332-343纳米),量子产量为21-38%,寿命为26-31 ns.
DFT计算揭示了非平面的纳基团几何在激发状态下,这是由于固态效应和C-C键缩短.
在水性有机悬浮中观察到较低的能量排放 (385-421 nm) 与更高的量子产量 (50-64%) 和更长的寿命 (28-40 ns).
在固态形式 (PMMA薄膜和散装固体) 中观察到类似的排放特性.

结论:

甲基和准碳酸衍生物具有可调节的光发光特性,取决于介质 (溶液与固态与悬浮).
结构特征,包括非平面纳基,在它们的光物理行为中起着重要作用.
这些发现突出了元和准碳化合物的潜力,用于开发具有明显固态发射特性的新型发光材料,与正体碳化合物类似物相美.

更多相关视频

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

相关概念视频

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π&VeryThinSpace;→&VeryThinSpace;π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...

Spectroscopy of Carboxylic Acid Derivatives

Spectroscopy of Carboxylic Acid Derivatives

Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...

Directing Effect of Substituents: meta-Directing Groups

Directing Effect of Substituents: meta-Directing Groups

Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...

IR and UV–Vis Spectroscopy of Carboxylic Acids

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency,...

Directing Effect of Substituents: ortho–para-Directing Groups

Directing Effect of Substituents: ortho–para-Directing Groups

Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...