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Three-center two-electron bond

    The '''3-center-2-electron bond''' is an electron deficient chemical bond where three atoms share two electrons The combination of three atomic orbitals form one bonding one non-bonding and one antibonding molecular orbital Since the two electrons go into the bonding orbital this constitutes a chemical bond between the three atoms
    This type of bond is seen in many boron compounds for example diborane B2H6 The monomer BH3 is unstable since the boron atom is only surrounded by six valence electrons To complete its octet it shares electrons with a B-H bond in another molecule This is also the case in trimethylaluminium where the methyl group is bridging and in the symmetrical hydrogen bond in [1]