You are working in the chemical stockroom of a university, and a teaching assistant requests two inorganic
Question:
You are working in the chemical stockroom of a university, and a teaching assistant requests two inorganic reagents. You want to make sure you deliver the correct materials, so you need to compare both the formulas and names from the request with the labels on the bottles.
(a) Name the coordination compound [Co(NH3)3(OH2)3]2(SO4)3.
(b) Write the formula of sodium dichloridobis(oxalato)platinate(IV).
PLAN Apply the rules in Toolbox 9C.1.
Transcribed Image Text:
Toolbox 9C.1 HOW TO NAME D-METAL COMPLEXES AND COORDINATION COMPOUNDS CONCEPTUAL BASIS d-Metal complexes are identified by giving the names and num- bers of the individual ligands. Because some names can be quite long, interpreting them is rather like eating a large bun: nibble it bite by bite, don't try to swallow it in one gulp. The rules used here are consistent with the latest (2005) IUPAC recommenda- tions. Further information on naming complexes can be found at http://old.iupac.org/publications/books/seriestitles/nomen- clature.html (referred to as the "Red Book"). PROCEDURE The following rules are adequate for most common complexes; more elaborate rules are needed if the complex contains more than one metal atom. Some rules apply to naming the complex (formally, the "coordination entity") and others to writing its chemical formula. A. Writing the formula 1. Write the chemical symbol of the central atom (usually a metal atom) first, followed by symbols for the ligands, then enclose the entire collection of symbols between square brackets and add the overall charge. 2. Write the chemical symbols of ligands in alphabetical order; when different ligands contain the same element, those denoted by a single letter (e.g., O) take precedence over sym- bols represented by two or more letters (e.g., OH). If a par- ticular point needs to be emphasized, then the order may be varied. Water as a ligand is denoted OH₂, to emphasize that the O links to the metal atom. Examples: [FeCl(OH₂)s] [Fe(NH₂),(OH₂)]³+ 3. To avoid any ambiguity, the linking atom can be underlined. 4. Greek prefixes indicate the number of each type of ligand in the complex ion: 2 3 5 di-tri- tetra- penta- hexa- If the ligand already contains a Greek prefix (such as the di- in ethylenediamine) or if it is polydentate (able to attach at more than one binding site simultaneously), then the follow- ing prefixes are used instead: 2 3 4 bis tris tetrakis- [FeCl(OH₂),]+ [Cr(CI),(NH3)4] *** 5. Ligands are named in alphabetical order, ignoring any Greek prefix. pentaaquachloridoiron(II) ion tetraamminedichloridochromium(III) ion (Note that in some cases the order of ligands in the name is not the same as the order in the formula.) 6. If there is an ambiguity in identifying which atom is linked to the metal atom, then KE is added to the name in parentheses, where E denotes the connecting atom (and k is kappa): [Fe(NCS)(OH₂)]²+ pentaaquathiocyanato (kN)iron(III) ion [Fe(NCS)(OH₂),12+ pentaaquathiocyanato(KS)iron(III) ion 7. If the complex has an overall negative charge (an anionic complex), the suffix -ate is added to the stem of the metal's name. If the symbol of the metal originates from a Latin name (as listed in Appendix 2D), then the Latin stem is used. For example, the symbol for iron is Fe, from the Latin ferrum. Therefore, any anionic complex of iron ends with -ferrate fol- lowed by the oxidation number of the metal in Roman numerals:
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Chemical Principles The Quest For Insight
ISBN: 9781464183959
7th Edition
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