1 / 13

Coordination Compounds

Coordination Compounds. Chapter 22. 20.3 Coordination Compounds. Metallic salts are surrounded by water when they dissolve. Dipoles in water are attracted to the ions. Complexes and Ligands.

obert
Download Presentation

Coordination Compounds

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Coordination Compounds Chapter 22

  2. 20.3 Coordination Compounds • Metallic salts are surrounded by water when they dissolve. • Dipoles in water are attracted to the ions.

  3. Complexes and Ligands • Ions in which a metal ion and either water or ammonia molecules compose a unit are examples of coordination compounds or complex ions. • Compounds containing a complex ion as part of their structure are called coordination compounds.

  4. Complexes and Ligands • You can write a complex ion as a hydrate, or (more current) as a single structure. NiCl2•6H2O OR [Ni(H2O)6]Cl2

  5. Complexes and Ligands • All coordiation complexes contain a metal atom/ion as the central part of the structure. • Ligands are molecules or ions bonded to the metal. • the number of ligands attached to the metal defines the coordination number

  6. Complexes and Ligands • Ligands are usually either neutral molecules or anions. Must have a lone pair of electrons (Lewis base)! • The attachment is called a coordinate covalent bond. • Net charge is the sum of the charges on the metal and its attached groups.

  7. Formulas of Coordination Complexes • Problem: Give the formulas of the following coordination complex: A Ni2+ ion is bound to two water molecules and two bidentate oxalate ions. This complex ion is constructed from two neutral H2O molecules, two C2O42- ions, and one Ni2+ ion, so the net charge is 2-. The formula is [Ni(C2O4)2(H2O)2]2-.

  8. Practice Problem • What is the formula of a complex ion composed of one Co3+ ion, three ammonia molecules, and three Cl- ions? • Determine the metal’s oxidation number and coordination number in (a) K3[Co(NO2)6] (b) Mn(NH3)4Cl2

  9. Naming Coordination Compounds • Name the cation first and then the anion. • For a complex ion, name the ligands first, in alphabetical order (disregard prefix), followed by the name of the metal.

  10. Naming Coordination Compounds • Ligands and their names: • If anion is –ite or –ate, the final e is changed to o. • If anion ends in –ide, the ending is changed to o. • If neutral molecule, its common name is used except for water (aqua), ammonia (ammine), and CO (carbonyl). • Use prefixes as needed.

  11. Naming Coordination Compounds • If the coordination complex is an anion, the suffix –ate is added to the metal name. • Following the name of the metal, the oxidation number of the metal is given as Roman numerals.

  12. Practice Problem • Name the following coordination compounds. • [Ni(H2O)6]SO4 • K[Pt(NH3)Cl3] • K[CuCl2]

  13. Homework • After reading Section 22.3, you should be able to do the following: • P.1055 (9-18)

More Related