Video Experimental Relacionado

Updated: May 4, 2026

High Resolution Physical Characterization of Single Metallic Nanoparticles

High Resolution Physical Characterization of Single Metallic Nanoparticles

Published on: June 28, 2019

Detección y estructura de HOON: la espectroscopia de microondas revela un enlace O-O de más de 1,9 Å

Kyle N Crabtree¹, Marat R Talipov, Oscar Martinez

¹Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.

Science (New York, N.Y.)

|December 17, 2013

Resumen

Los investigadores detectaron nitrosil-O-hidróxido en fase gaseosa (HOON), un isómero del ácido nitroso (HONO), que anteriormente se pensaba que era inestable. Esta molécula exhibe un enlace O-O sorprendentemente largo y una notable estabilidad en experimentos.

Área de la Ciencia:

Química de la atmósfera La química de la atmósfera
Espectroscopia molecular Espectroscopia molecular es la espectroscopia molecular.
Química cuántica es la química cuántica.

Sus antecedentes:

El óxido nítrico (NO) y los radicales hidroxilo (OH) son especies atmosféricas clave.
Su reacción forma principalmente ácido nitroso (HONO).
El isómero nitrosil-O-hidróxido (HOON) es poco conocido debido a su presunta inestabilidad.

Objetivo del estudio:

Para detectar y caracterizar la molécula HOON en fase gaseosa.
Para determinar con precisión su estructura molecular.
Para evaluar su estabilidad y abundancia en relación con HONO.

Principales métodos:

Detección de la fase gaseosa utilizando técnicas de haz molecular supersónico.
Espectroscopia de microondas con transformación de Fourier de alta resolución.
Sustitución isotópica ((2) H, (15) N, (18) O) para el análisis estructural detallado.

Principales resultados:

Detección exitosa y determinación estructural de HOON. en fase gaseosa.
HOON posee el enlace O-O más largo jamás observado en una molécula (1.9149 ± 0.0005 Å).
HOON muestra una estabilidad inesperada, con una abundancia de alrededor del 3% de HONO.

Conclusiones:

La inestabilidad percibida de HOON es cuestionada por la evidencia experimental.
HOON es un producto estable, aunque menor, de la reacción NO + OH.
Este hallazgo abre nuevas vías para la comprensión de las vías de reacción atmosférica y las propiedades moleculares.

Más Videos Relacionados

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

Published on: April 12, 2017

Videos de Conceptos Relacionados

IR Spectrum Peak Broadening: Hydrogen Bonding

IR Spectrum Peak Broadening: Hydrogen Bonding

The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...

IR Frequency Region: X–H Stretching

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of 2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...

2D NMR: Overview of Homonuclear Correlation Techniques

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

¹H NMR: Interpreting Distorted and Overlapping Signals

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the...