CHE 141 1st Edition Lecture 22 Current LectureNomenclature- The names of complex ions and coordination compound list tell us:o Identity and oxidation state of central metalo Names and numbers of ligandso Overall charge (complex ions)o Identity of counter ions (coordination compounds)Naming Ligands- Neutral ligands have the same name as the molecules save for the notable exceptionso H2O ligands are named aquao NH3 ligands are named ammineo CO ligands are named carbonyl- Anionic ligands have the name of the ion plus an ending modified as follows:o –ide becomes –oo –ate becomes –atoo –ite becomes –itoThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Prefixeso 2=di-(bis-)o 3=tri-(tris)o 4=tetra-(tetrakri-)o 5=penta-(pentakris-)o 6=hexa-(hexakris-)Naming Complex Ions with Positive Charge- 1. Identify the ligand(s), if there is more than one then list names alphabetically- 2. In front of the ligand name(s) written in step 1, use the Greek prefixes to indicate the number of each type of ligand, alphabetical order is based on ligand name not prefix- 3. Write the name of the transition metal with Roman numeral indicating its oxidation state- Example: What is the name of Ni(H2O)6^2+o 1. Name of ligand=aquao 2. Number of ligands=6, so hexaaquao 3. Name of metal= hexaquanickelo 4. Oxidation state of metal=+2o Name of complex ion=hexaaqanickel (II)Naming Complex Ions with Negative Charge- 1. Follow the same steps for naming positively charged complexes- 2. Add-ate to the name of the central metal ion to indicate that the complex ion carries a negative charge- 3. Some metals use the Latin root for their name with the –ate at the endingo copper becomes cuprateo gold becomes aurateo iron becomes ferrateo lead becomes plumbateo silver becomes argenateo tin becomes stannate- Example: What is the name of [Al(H2O)2(OH)4]-o 1. Name of ligands=aqua, hydroxoo 2. Number of ligands=2 x aqua, 5 x hydroxo, so diaqua, tetrahydroxoo 3. Name of metal + -ate=diaquatetrahydroxo aluminateo 4. Oxidation state of metal=+3o Name of complex ion= Diaquatetrahydroxoaluminate (III)Naming Coordination Compounds- If the counter ion of the complex ion is a cation, the cation name goes first, followed by the name of the anionic complex ion- If the counter ion of the complex ion is an anion, the name of the cationic complex ion goes first, followed by the anion- Note that if the counter ion of the complex is a cation then the complex ion has a negativecharge: add –ate to the central metal- Example: What is the name of [Ni(NH3)6]Cl2o Name of ligands=ammineo Number of ligands=hexaammineo Name of metal= hexaamminenickelo Oxidation state of metal=2+o Counterion=chlorideo Name of complex ion=hexaamminenickel(II)
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