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BRIDGE BONDING · ADVANCED CONCEPT

Be₂Cl₄
Beryllium chloride dimer bonding

Vapour-phase BeCl₂ can form the planar Be₂Cl₄ dimer through two reciprocal chlorine bridges. A lone pair from each bridging chlorine points toward the neighbouring electron-poor beryllium centre.

3c–4e chlorine bridgeChemical BondingInteractive 3D lab
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STRUCTURE REASONING

How Be₂Cl₄ bridge bonding works.

Each Be–Cl–Be bridge is treated as a 3c–4e unit: one Be–Cl shared pair is retained and a chlorine lone pair supplies the additional pair. Both bridges form at the same time, giving a planar six-atom skeleton.

BOND COUNT

2 × 3c–4e bridges + 2 × terminal 2c–2e Be–Cl bonds

TERMINAL VS BRIDGE

Bridge Be–Cl contacts are weaker than the terminal Be–Cl bonds.

ADVANCED CONCEPT CHECKLIST

Facts to read from the 3D model.

  1. BeCl₂ changes from a linear sp monomer model to an approximately sp²-directed Be environment in the dimer.
  2. Two bridging and two terminal chlorine atoms complete the Be₂Cl₄ structure.
  3. The displayed Be–Cl–Be bridge angle is approximately 106°.
  4. Unlike the hydrogen bridge in Be₂H₄, chlorine can provide a lone pair, so Be₂Cl₄ is classified as 3c–4e.

SEARCHED QUESTIONS

Be₂Cl₄ bridge-bonding FAQ.

What is the bridge-bond type in Be2Cl4?

Each Be–Cl–Be bridge is represented as a three-centre four-electron unit involving a chlorine lone pair.

Is Be2Cl4 planar?

Yes. The complete Be₂Cl₄ dimer is shown as a planar six-atom skeleton.

How is Be2Cl4 different from Be2H4?

Be₂Cl₄ uses chlorine lone-pair donation and a 3c–4e description, while Be₂H₄ has hydrogen bridges with no lone pair and is a 3c–2e system.

MOLECULE-BY-MOLECULE GUIDES

Study every bridge-bonding system.

Open a focused structure guide, then use the shared 3D lab to rotate the complete molecule and compare bridge formation.