Zinc in Coordination Compounds: Charge & Roman Numerals

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Discussion Overview

The discussion revolves around the naming conventions for coordination compounds, specifically focusing on the representation of the oxidation state of zinc in compound names. Participants explore the general rules for indicating charges using Roman numerals and the implications of not specifying the charge in certain cases.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant asserts that the charge of a coordination metal must be stated in Roman Numerals, with a default assumption of +1 if unspecified.
  • Another participant questions this assumption, suggesting that the oxidation state may be left unspecified if the metal is in its most common oxidation state, which for zinc is +2.
  • A third participant acknowledges uncertainty about their previous claim regarding the assumption of +1 charge and reflects on zinc's tendency to lose 2 electrons from its outer shell.
  • A fourth participant confirms the correctness of the statement regarding zinc's electron loss.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of specifying the oxidation state for zinc in compound names, with some believing it should always be stated and others suggesting it may not be necessary when the common oxidation state is known. The discussion remains unresolved regarding the general rule application.

Contextual Notes

There is a lack of consensus on the rules for naming coordination compounds, particularly concerning the specification of oxidation states for metals like zinc. The discussion highlights assumptions about common oxidation states and their implications for naming conventions.

pivoxa15
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I thought that as a general rule when writing out compound names (in full) involving a coordination metal, the charge of the coord metal must be stated in Roman Numerals. If nothing is specified than a charge of +1 is assumed.

But I came across a compound involving zinc written zinc... without any roman numeral so I assumed it had +1 charge when bound within the compound. But it turned out to have +2 charge. Why don't they specify it by writing zinc(II)... ?
 
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pivoxa15 said:
I thought that as a general rule when writing out compound names (in full) involving a coordination metal, the charge of the coord metal must be stated in Roman Numerals. If nothing is specified than a charge of +1 is assumed.
Where did you get that last bit from? From what I recall, the oxidation state may be left unspecified if the metal is in its most common oxidation state. For Zinc, the +2 oxidation state is most common.
 
Good point, I think I made it up. Zinc likes to lose 2 electrons in its outer 4S shell doesn't it.
 
Yes, that's right.
 
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