8. Compounds and Complexes Flashcards
What is an anion?
a negatively charged ion
What is a cation?
a positively charged ion
What is a coordinate bond?
a covalent bond between a Lewis acidic metal ion and a Lewis basic ligand in which both electrons originate from the ligand
What is a coordination complex?
acoordination complexconsists of a central atom or ion, which is usually metallic and is called thecoordinationcentre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents
What is a coordination number?
the number of donor atoms coordinated to a metal ion
What is a counter ion?
an ion that balances the charge on a cationic or anionic complex ion
What is dissociation?
a general process in which molecules separate into smaller particles
What is a donor atom?
an atom of a ligand in a complex that is directly coordinated to the transition metal ion
What is Kepert theory?
a modification of VSEPRtheoryused to predict the 3-dimensional structures of transitional metal complexes
What is a Lewis acid?
an electron-pair acceptor
What is a Lewis base?
an electron-pair donator
What is a ligand?
a molecule or an anion that can coordinate to a transition metal ion to form a complex
What is a octahedral conformation?
describes a molecule in which a central atom is surrounded by six atoms located at the vertices of an imaginary octahedron
What is an oxoanion?
a negatively charged ion containing two or more elements, one of which is oxygen
What is a square planar conformation?
a geometry adopted by 4-coordinate complexes in which the four M-L bonds point to the corners of a square
What is a tetrahedral conformation?
a geometry adopted by 4-coordinated complexes in which the central metal ion is coordinated to four ligand donor atoms located at the corners of an imaginary tetrahedron
What is the oxidation state of metals in their elemental form?
0
What does a coordination complex consist of?
A central cation metal ion bonded to molecular or anionic ligands
Why do coordination complexes form?
The positive metal ion is a Lewis acid (an electron pair acceptor) and the ligands surrounding it are Lewis bases (electron pair donors)
What type of bond forms between the metal and the ligands?
Cooridnate bond/donor covalent bond/dative bond
What does a coordination compound consist of?
The metal complex and counterions
True or False: A coordination compound may dissociate into anions and cations in solution
True
