Charge on Coordinations Sphere||Chelates||Chelation||Chelating Agents||Examples

Описание: Charge on Coordinations Sphere||Chelates||Chelation||Chelating Agents||Examples #pashtolecture

This Pashto Video lecture we learned about the concept and calculations of Charge on Coordination sphere and Chelate, Chelation and Chelating Agents Examples and explanation.


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Great topic—this is **core coordination chemistry**, so let’s make it clean, exam-ready, and easy to remember 👌

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*1. Charge on Coordination Sphere*

*Coordination sphere*

It includes the *central metal ion + ligands directly attached to it* (inside square brackets).

*How to find the charge*
{Charge on coordination sphere} = {Charge on metal ion} + \sum ({charges of ligands})
]

*Examples*

*Example 1:*
[Co(NH_3)_6]Cl_3]

NH₃ = neutral ligand
Co = +3

✔ Charge on coordination sphere = *+3*

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*Example 2:*
[K_4][Fe(CN)_6]

Fe = +2
CN⁻ = –1 × 6 = –6

[
+2 + (–6) = –4
]

✔ Charge on coordination sphere = *–4*

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*Example 3:*
[
[Cu(NH_3)_4]SO_4
]

✔ Charge on coordination sphere = *+2*

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*2. Chelates*

*Definition*

A *chelate* is a coordination compound in which a *polydentate ligand* forms *ring structures* with a metal ion.

📌 Ring formation is the key word.

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*Example*

[Cu(en)_2]^{2+}]

en = ethylenediamine (bidentate ligand)
Two rings are formed

✔ This compound is a *chelate*

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*3. Chelation*

*Definition*

*Chelation* is the process by which a **polydentate ligand binds to a metal ion through two or more donor atoms**, forming ring structures.

📌 Process = chelation
📌 Product = chelate

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*Example*

When *EDTA⁴⁻* binds with **Ca²⁺**, chelation occurs.

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*4. Chelating Agents*

*Definition*

Chelating agents are *polydentate ligands* that can bind a metal ion at *more than one point* and form chelates.

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*Common Chelating Agents & Examples*

| Chelating Agent | Denticity | Example |
| -------------------- | ----------- | -------------------------- |
| Ethylenediamine (en) | Bidentate | [Cu(en)₂]²⁺ |
| Oxalate (C₂O₄²⁻) | Bidentate | [Fe(C₂O₄)₃]³⁻ |
| EDTA⁴⁻ | Hexadentate | [Ca–EDTA]²⁻ |
| Glycine | Bidentate | Metal–amino acid complexes |

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*5. Importance / Extra Point (Exam Favorite ⭐)*

🔹 *Chelate complexes are more stable* than complexes with monodentate ligands
→ This is called the *Chelate Effect*

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*One-line Memory Trick 🧠*

*Chelation* → process
*Chelate* → ring compound
*Chelating agent* → polydentate ligand