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Spin-crossover (SCO) materials have attracted much attention because of their bistability and potential applications in molecular electronics.1 Most SCO materials reported so far concemed Fe(Ⅱ) and Fe(Ⅲ) complexes and to a less extent Co(Ⅱ),2 because SCO Co(Ⅱ) complexes usually display gradual, incomplete and non-hysteretic behaviour.