when do we add -ate in the IUPAC nomenclature of coordination compounds?

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If the coordination sphere of the complex, has negative charge , then the name of the central metal atom ends in ate, and the oxidation state of the metal is written in Roman numerals in a bracket at the end of the name of  the metal atom.
For example: Cr: Chromate ; Co: Cobaltate
For example: Na2[CrOF4]is named as Sodiumtetraflourooxochromate(IV)


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ate is added for the nomenclature of the complexes which act as anions for example (Fe(C2O4)3)3- is trioxalatoferrate(iii) iron.
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