Word Count : 260

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The cis square-planar complex of the type cis-[Mabcd] may exist as a pair of enantiomers due to the unsymmetrical arrangement of ligands around the metal centre. Interconversion of these enantiomers can occur through a bond rupture mechanism that proceeds via a trigonal bipyramidal intermediate. In this mechanism, one metal–ligand bond in the square-planar complex is weakened and partially broken, allowing the coordination number of the ____ ___ ____ ___ ____ ______.
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