NEET Exam > NEET Notes > Chemistry Class 12 > Mnemonics:Coordination Compounds
Mnemonics:Coordination Compounds | Chemistry Class 12 - NEET PDF Download
| Table of contents |
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| Introduction |
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| Geometrical Isomerism in Coordination Compounds |
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| Crystal Field Theory |
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| Spectrochemical Series: Strong Field Ligand |
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| Spectrochemical Series: Weak Field Ligand |
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Introduction
Coordination compounds may seem complex, but with the help of these engaging mnemonics, you’ll master their structures, naming rules, and bonding principles in no time! Let's make learning fun and memorable.
Geometrical Isomerism in Coordination Compounds
- Cis isomer: Ligands are positioned next to each other, usually at a 90° or 180° angle.
- Trans isomer: Ligands are positioned opposite each other, typically at 180°.
Mnemonic: "Cis Stays Close, Trans Travels Away."
- Cis Stays Close: In Cis isomerism, Similar ligands stay close (90° angle)
- Trans Travels Away: In Trans isomerism, Similar ligands are opposite (180° angle)
Crystal Field Theory
Explains: The difference between strong-field and weak-field ligands.
- Mnemonic: "Strong Tigers Love Low Energy."
- Strong: Strong-field ligands (e.g., CN⁻, CO)
- Tigers: Trigger pairing of electrons (low spin)
- Love: Leads to
- Low Energy: Smaller magnetic moment and lower energy configuration
Spectrochemical Series: Strong Field Ligand
The ligands in increasing order of their field strength are:
NCS⁻ (Thiocyanate), NO₂⁻ (Nitrite), NH₃ (Ammonia), en (Ethylenediamine), CN⁻ (Cyanide), CO (Carbon Monoxide).
- Mnemonic : "Nancy's Naughty Nephew Eats Chocolate Cake."
- Nancy's: NCS⁻ (Thiocyanate)
- Naughty: NO₂⁻ (Nitrite)
- Nephew: NH₃ (Ammonia)
- Eats: en (Ethylenediamine)
- Chocolate: CN⁻ (Cyanide)
- Cake: CO (Carbon Monoxide)
Spectrochemical Series: Weak Field Ligand
The weak field ligands in increasing order of their field strength are:
I⁻ (Iodide) < Br⁻ (Bromide) < Cl⁻ (Chloride) < S²⁻ (Sulfide) < F⁻ (Fluoride) < OH⁻ (Hydroxide) < SO₄²⁻ (Sulphate) < C₂O₄²⁻ (Oxalate) < H₂O (Water).
- Mnemonic: "I Bring Clear Smiles, For Our Sweet Children Who Wait."
- I: Iodide (I⁻)
- Bring: Bromide (Br⁻)
- Clear: Chloride (Cl⁻)
- Smiles: Sulfide (S²⁻)
- For: Fluoride (F⁻)
- Our: Hydroxide (OH⁻)
- Sweet: Sulphate (SO₄²⁻)
- Children: Oxalate (C₂O₄²⁻)
- Who: Water (H₂O)
- Wait: (as a reminder, indicating they are the weaker field ligands)
By using these fun and memorable mnemonics, understanding the complexities of coordination compounds, their isomerism, and field strength becomes much easier. Keep practicing, and soon these concepts will feel second nature!
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FAQs on Mnemonics:Coordination Compounds - Chemistry Class 12 - NEET
| 1. What is geometrical isomerism in coordination compounds? |  |
Ans. Geometrical isomerism in coordination compounds refers to the different spatial arrangements of ligands around a central metal atom. In octahedral complexes, for example, ligands can be arranged in a cis or trans configuration, leading to distinct isomers with different physical and chemical properties.
| 2. How does Crystal Field Theory explain the color of coordination compounds? | |
Ans. Crystal Field Theory explains that the interaction between the central metal ion and surrounding ligands leads to the splitting of d-orbitals into different energy levels. The specific wavelengths of light absorbed during electronic transitions between these split d-orbitals determine the color of the coordination compound observed.
| 3. What are strong field and weak field ligands in the context of the spectrochemical series? | |
Ans. Strong field ligands are those that create a large splitting of d-orbitals, causing higher energy transitions and often leading to low-spin complexes. Examples include CN⁻ and CO. Weak field ligands result in smaller splitting, allowing for high-spin complexes; examples include I⁻ and Br⁻. The placement of ligands in the spectrochemical series reflects their relative strengths.
| 4. How can mnemonics help in remembering the order of ligands in the spectrochemical series? | |
Ans. Mnemonics can be used as memory aids to remember the order of ligands in the spectrochemical series by creating phrases or sentences where each word corresponds to a ligand. For instance, a phrase like "Strong Cool Cats Prefer Lovely Dogs" can help recall the order from strong field ligands (CN⁻, CO) to weaker ones (I⁻, Br⁻).
| 5. Why is the understanding of geometrical isomerism important in coordination chemistry? | |
Ans. Understanding geometrical isomerism is crucial because different isomers can exhibit varied properties such as differences in reactivity, solubility, and biological activity. This knowledge is essential for applications in fields like drug design and materials science, where specific isomer characteristics can significantly impact performance and effectiveness.
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Dec 22, 2024 Last updated |
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