A neutral macrocyclic ligand with four donor atoms produces a red diamagnetic low-spin d8 complex of Ni(II) if the anion

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correctanswer
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A neutral macrocyclic ligand with four donor atoms produces a red diamagnetic low-spin d8 complex of Ni(II) if the anion

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A neutral macrocyclic ligand with four donor atoms produces a
red diamagnetic low-spin d8 complex of Ni(II) if the anion is the
weakly coordinating perchlorate ion, ClO4 - . When perchlorate is
replaced by two thiocyanate ions, SCN− , the complex turns violet
and is high-spin with two unpaired electrons. Interpret the change
in terms of structure
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