Nitrosylbromid

Nitrosyl Bromide: A Deep Dive into a Reactive Interhalogen Compound

Nitrosyl bromide (NOBr), a fascinating inorganic compound, holds a unique position in chemistry due to its reactive nature and the intriguing interplay of its constituent elements: nitrogen, oxygen, and bromine. This article aims to provide a comprehensive overview of nitrosyl bromide, encompassing its properties, synthesis, reactions, and applications, ultimately clarifying its significance within the broader context of chemical science. We will explore its structure, reactivity, and potential uses, while also addressing common misconceptions.

1. Properties of Nitrosyl Bromide

Nitrosyl bromide is a reddish-brown gas at room temperature, readily condensing into a dark-red liquid. Its pungent odor is characteristic of many nitrogen oxides. Key physical properties include:

Molecular Weight: Approximately 109.91 g/mol
Melting Point: -55.5 °C
Boiling Point: -2.7 °C
Solubility: Soluble in nonpolar solvents like carbon tetrachloride (CCl₄) but reacts with polar solvents like water.

The molecule possesses a bent structure, with the nitrogen atom at the center, bonded to an oxygen atom and a bromine atom. This geometry arises from the presence of a lone pair of electrons on the nitrogen atom, leading to a trigonal planar electron-pair geometry and a bent molecular geometry. The N=O bond is a relatively strong double bond, while the N-Br bond is a weaker single bond. This difference in bond strength significantly influences the molecule's reactivity.

2. Synthesis of Nitrosyl Bromide

Nitrosyl bromide can be synthesized through several methods, the most common being the direct reaction of nitric oxide (NO) and bromine (Br₂) gas:

2NO(g) + Br₂(g) ⇌ 2NOBr(g)

This reaction is an equilibrium process, meaning that the formation of NOBr is reversible. The equilibrium can be shifted towards the product side by increasing the pressure or lowering the temperature. Alternatively, nitrosyl bromide can be prepared by reacting nitrosyl chloride (NOCl) with potassium bromide (KBr):

NOCl + KBr → NOBr + KCl

This method offers a cleaner synthesis, avoiding the potential for side reactions encountered in the direct combination of NO and Br₂.

3. Chemical Reactions of Nitrosyl Bromide

Nitrosyl bromide is a reactive compound, participating in various chemical reactions. Its reactivity stems primarily from the polarized nature of the N-Br bond, making the bromine atom susceptible to nucleophilic attack.

Hydrolysis: Reaction with water leads to the formation of nitric oxide, hydrobromic acid, and nitrous acid:

2NOBr + H₂O → NO + HNO₂ + 2HBr

Reactions with Metals: NOBr can oxidize certain metals, forming metal bromides and releasing nitric oxide. For example, its reaction with copper would produce copper(I) bromide and nitric oxide gas.

Reactions with Lewis Bases: NOBr acts as a Lewis acid, accepting electron pairs from Lewis bases such as ammonia (NH₃).

4. Applications of Nitrosyl Bromide

Despite its reactive nature, nitrosyl bromide finds limited practical applications. Its primary use is primarily within research settings, specifically in:

Study of Nitrosation Reactions: NOBr is employed in studies involving nitrosation, a process crucial in various chemical and biological systems. Its role in nitrosation reactions provides valuable insights into this important chemical process.
Synthesis of Other Nitrogen Compounds: NOBr serves as an intermediate or reagent in specialized syntheses of certain nitrogen-containing compounds. Its specific utility depends on the desired target molecule and reaction conditions.

5. Safety Precautions

Nitrosyl bromide is a toxic and corrosive substance. It is crucial to handle it with extreme caution, employing appropriate safety measures, including:

Use of a Fume Hood: All handling and reactions involving NOBr must be performed within a well-ventilated fume hood to minimize inhalation risks.
Protective Equipment: Appropriate personal protective equipment (PPE) such as gloves, safety goggles, and a lab coat is mandatory when working with this compound.
Proper Storage: NOBr should be stored in sealed, inert containers in a cool, dry place, away from incompatible materials.

Conclusion

Nitrosyl bromide, despite its limited practical applications, remains a chemically intriguing compound. Its synthesis, properties, and reactivity highlight the complex interplay between its constituent elements and offer valuable insights into the behavior of inorganic molecules. Understanding its characteristics is essential for safe handling and utilization in research settings.

FAQs:

1. Is nitrosyl bromide flammable? No, nitrosyl bromide is not considered flammable.
2. What is the toxicity of nitrosyl bromide? Nitrosyl bromide is toxic through inhalation and skin contact. It is a respiratory irritant and can cause severe burns.
3. How is nitrosyl bromide disposed of? Disposal should be carried out according to local regulations, often involving neutralization with a base followed by careful disposal of the resulting solution.
4. Can nitrosyl bromide be stored in glass containers? While glass is often suitable for storing many chemicals, it's crucial to ensure the glass is resistant to the corrosive nature of NOBr. Check for compatibility before storage.
5. What is the difference between nitrosyl bromide and nitrosyl chloride? Both are nitrosyl halides, but they differ in their halogen component (bromine vs. chlorine). This difference leads to variations in reactivity and properties. NOCl is generally more readily available and used in synthetic chemistry.

Search Results:

Principles of Chemical Science, Solutions for Lecture 18: … Calculate the [NOBr], [NO], and [Br2] when 10.0 mol of nitrosyl bromine is placed in a 5.00-L closed vessel and allowed to decompose. For information about citing these materials or our …

CH 222 Winter 2025: Problem Set #6 - mhchem.org 2. Nitrosyl bromide, NOBr, is formed from NO and Br 2. Experiments show that this reaction is second order in NO and ﬁrst order in Br 2. The equation: 2 NO(g) + Br 2(g) → 2 NOBr(g) a. …

www.dynamicpapers.com Cambridge International Examinations … This document consists of 17 printed pages and 3 blank pages. Answer all the questions in the spaces provided. The compound nitrosyl bromide, NOBr, can be formed by the reaction …

Answer on Question #63427, Chemistry / General Chemistry A sample of nitrosyl bromide (NOBr) decomposes according to the equation 2NOBr(g)⇌2NO(g)+Br2(g) An equilibrium mixture in a 5.00-L vessel at 100 ∘C contains 3.27 …

Practice E4 1. In a study of nitrosyl halides, a chemist proposes the following mechanism for the synthesis of nitrosyl bromide, NOBr, from nitrogen monoxide and bromine vapor. 20 kJ + NO + Br 2 ⇆ …

Reaction of Nitrosyl Bromide Upon Mono Unsaturated Fatty ACID In the present work attempts has been made to synthesize nitosyl bromide in situ and chemical reaction has been carried out between nitrosyl bromide with methyl oleate. The products …

The Kinetics Following Photolysis of Nitrosyl Bromide OF NITROSYL BROMIDE . THESIS Lori A. Mahoney, Civilian AFIT/GAP/ENP/04-07 . DEPARTMENT OF THE AIR FORCE AIR UNIVERSITY . AIR FORCE INSTITUTE OF …

Durham E-Theses Kinetic and mechanistic studies on nitrosation … 4 Feb 2025 · nucleophilic catalysis by chloride, bromide, thiocyanate ions and thiourea was observed in all cases. Most of the kinetic results are consistent with a mechanism involving a …

bestexamhelp 1 The compound nitrosyl bromide, NOBr, can be formed by the reaction shown. 2NO + Br 2 2NOBr (a) Using oxidation numbers, explain why this reaction is a redox reaction..... [2] (b) …

Durham E-Theses Aspects of nitrosation & diazotization These results infer the importance of free nitrosyl chloride in attacking the para-position of the ring. Tha t it exists is 'proven' by the trans-nitrosation reactions. Adding NaNOg to HCl creates …

Ch 16 Interpreting Rate Law Practice Worksheet 2. Nitrosyl bromide, NOBr, is formed from NO and Br 2: 2 NO (g) + Br 2 (g → 2 NOBr üg) Experiments show the reaction is second order in NO and first order in Br 2. a. Write the rate …

Principles of Chemical Science, Problems for Lecture 18: … The decomposition of nitrosyl bromide (NOBr) proceeds by the following reaction: 2NOBr (g) ⇌. 2NO (s) + Br. 2 (g) K = 0.0142 Calculate the [NOBr], [NO], and [Br. 2] when 10.0 mol of nitrosyl …

Nucleophilic catalysis of nitrosation: relationship between … Nitrosyl Bromide Schmid and Fouad9 experimentally determined the equilibrium constant for nitrosyl bromide as 5.1×10-2 M-2. Turney and Wright8 have again assigned the equilibrium

Rhodium Nitrosyl Complexes The reactions of nitrosyl chloride and nitrosyl bromide with rhodinrn(I) complexes containing triphenylphos- phine and triphenylarsine have boon studied. These reactions result in the …

Study of the Reaction of Nitrosyl bromide upon Methyl 10 ... - JETIR formation. The absence of nitrosyl band in the region 1520-1570 cm-1 further supported the dimer formation. The NMR spectrum also supported the structure of compound (III) as dimer of …

Structural and Optical Properties of Metal-Nitrosyl Complexes Metal-nitrosyl coordination compounds characterized by high quantum yields of NO release are particularly adapted to site-specific delivery in tumor cells within photodynamic therapy (PDT).

A Comprehensive Study on The Reaction of Nitrosyl Bromide on … The present work gives a comprehensive study on the reaction between nitrosyl bromide with Methyl docos-trans-2-enoate (I). The products were isolated and analyzed and their structures …

Cl12 - University of Eswatini Nitrosyl bromide decomposes according to the following equation. sample of NOBr (0.64 mol) was placed in a 1.00-L flask containing no NO or Br2' At equilibrium the flask contained 0.36 mol of …

29 BrNO Nitrosyl bromide - Springer 80 29 BrNO Nitrosyl bromide DOI: 10.1007/978 -3-642 -10371 -1_31 Landolt -Börn stein © Springer 2010 New Series II/29D1 Quantum

Cambridge International Examinations Cambridge International … This document consists of 17 printed pages and 3 blank pages. Answer all the questions in the spaces provided. The compound nitrosyl bromide, NOBr, can be formed by the reaction …