Nabh4 Essay
Objective
The goal of this experiment is to characterize NaBD4 and NaBH4 using infrared (IR) spectroscopy and melting points. The changes in the spectra due to isotopic labeling are compared to calculated values from the simple harmonic oscillator model. In addition, the specific molecular vibration nodes are visualized using computational chemistry software.
Introduction
The Lewis acid-base is defined simply: acids accept electrons, and bases donate electrons. Lewis acids and bases are important in inorganic syntheses because bonds are usually formed between an electron-deficient Lewis base and electron-rich Lewis acid in the absence of compounds that are unable to donate protons.
There are two types of boron-hydrogen bonds, in which the classical B-H bond is a 2-center-2-electron bond similar to the carbon-hydrogen bond. The non-classical bond, however, has two electrons formed between two boron atoms and one hydrogen atom, making it a 3-center-2-electron bond1. Although this bonding is unique, boron hydrides are common reagents in organic syntheses1. …show more content…
This molecule is a strong acid and exists in equilibrium with B2H62. Lewis bases react with BH3 to form an adduct. B2H6 spontaneously combusts in air, reacts with minute amounts of water, and is toxic, so NaBH4 is synthesized alternatively2.
The simple diatomic oscillator model allows scientists to understand complex nodes of vibration, the motion of atoms, and much more3. The energy of an ideal chemical bond is quantized using the equation:
where is vibrational frequency (=) and is reduced, or effective, mass3. For simple diatomic molecules, is defined
The goal of this experiment is to characterize NaBD4 and NaBH4 using infrared (IR) spectroscopy and melting points. The changes in the spectra due to isotopic labeling are compared to calculated values from the simple harmonic oscillator model. In addition, the specific molecular vibration nodes are visualized using computational chemistry software.
Introduction
The Lewis acid-base is defined simply: acids accept electrons, and bases donate electrons. Lewis acids and bases are important in inorganic syntheses because bonds are usually formed between an electron-deficient Lewis base and electron-rich Lewis acid in the absence of compounds that are unable to donate protons.
There are two types of boron-hydrogen bonds, in which the classical B-H bond is a 2-center-2-electron bond similar to the carbon-hydrogen bond. The non-classical bond, however, has two electrons formed between two boron atoms and one hydrogen atom, making it a 3-center-2-electron bond1. Although this bonding is unique, boron hydrides are common reagents in organic syntheses1. …show more content…
This molecule is a strong acid and exists in equilibrium with B2H62. Lewis bases react with BH3 to form an adduct. B2H6 spontaneously combusts in air, reacts with minute amounts of water, and is toxic, so NaBH4 is synthesized alternatively2.
The simple diatomic oscillator model allows scientists to understand complex nodes of vibration, the motion of atoms, and much more3. The energy of an ideal chemical bond is quantized using the equation:
where is vibrational frequency (=) and is reduced, or effective, mass3. For simple diatomic molecules, is defined