What is the systematic name of [Co(en) 2 (NH 3 )CN]Cl 2 .

What is the systematic name of this large compound? Alright. So this thing is composed of the complex ion portion and the counter ion portion. The counter ion is chloride, so that's gonna form the end of the name since we're naming this like an ionic compound. So it end with chloride. All we have to do now is figure out what is this complex ion portion, named as in terms of this whole compound. The 2 down here that was with this chloride ion came from this complex ion, so it was 2+. Alright. So here we have to name our ligands alphabetically. Alright. So here, this is ethylenediamine. Then we have this ammonia molecule, which would be amine, two n's. And then we have this cyanide ion, which is cyanide. Alright. So alphabetical order, the amine portion comes first. So it would be amine, 2 n's, first. Next, cyano comes, so there's only one of it, so it's cyano. For our ethylenediamine, because it has the numerical prefix di in its name, we'd use bis, tris, or tetrakes, depending on how many we have. Here we have 2 of them, so this would be bis. In this situation, when we're using this, we have to put parentheses around the Ligand itself, so this would be ethylenediaminediaminediaminediaminethesis. And because the Cobalt ion is part of a positively charged complex ion, it keeps its name, so this would be Cobalt. But we need to know its charge, here, this is a neutral ligand so this is 0, this is 0, and this is -one. So we're going to say, x plus 2 times 0, plus 0 plus 1 times -one equals plus 2. X minus 1 equals plus 2. X equals plus 3. So while so here, cobalt is 3 plus, so this would be cobalt 3 ion. And then again, that's the cation portion. The anion portion is just chloride. If it's an anion, you keep you change the ending to ide. So this will be the whole name of this particular coordination compound.

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24. Transition Metals and Coordination Compounds

Naming Coordination Compounds

General Chemistry

24. Transition Metals and Coordination Compounds

Naming Coordination Compounds

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Multiple Choice

What is the systematic name of [Co(en)₂(NH₃)CN]Cl₂.

Amminocyanodiethylenediaminecobalt(II) chloride

Amminecyanobisethylenediaminecobalt(II) chloride

Amminocyanodi(ethylenediamine)cobalt(III) chloride

Amminecyanobis(ethylenediamine)cobalt(III) chloride

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Verified step by step guidance

Identify the central metal ion in the complex. Here, it is cobalt (Co).

Determine the oxidation state of the central metal ion. The complex is neutral overall, and the ligands are ethylenediamine (en), ammonia (NH3), and cyanide (CN). Ethylenediamine is a neutral ligand, ammonia is also neutral, and cyanide has a charge of -1. The chloride ions (Cl) outside the complex contribute a -2 charge. Therefore, the oxidation state of cobalt must be +3 to balance the charges.

List the ligands in alphabetical order, using their proper names: 'ammine' for NH3, 'cyano' for CN, and 'ethylenediamine' for en. Since there are two ethylenediamine ligands, use the prefix 'bis' to indicate this.

Combine the ligand names with the metal name and its oxidation state. The ligands are listed as 'ammine', 'cyano', and 'bis(ethylenediamine)', followed by the metal 'cobalt' with its oxidation state in Roman numerals, (III).

Add the counter ion name at the end. Since there are two chloride ions, the name ends with 'chloride'. Thus, the systematic name is 'Amminecyanobis(ethylenediamine)cobalt(III) chloride'.