Transition metals Flashcards
What is a transition metal?
has an incomplete d-subshell either as an element or as one of its common ions
What are the four characteristics of transition metals?
-can form complexes
-can form coloured ions
-have variable oxidation states
-catalytic activity
Why is copper a transition metal?
-although the atom of copper does not have an incomplete d-subshell
-but Cu2+ does have an incomplete d-subshell
Why is zinc not a transition metal?
neither zinc nor Zn2+ have an incomplete d-subshell
What is the most common ion complex shape, bond angle, and coordination number?
octahedral, 90, 6
How many monodentate ligands can form?
6 coordinate bonds to the central metal ion
What is a complex ion?
consists of a central transition metal ion with ligands that are covalently bonded to it via coordinate bonds
What is a ligand?
a species that can donate one or more pairs of electrons to the metal ion
What are monodentate ligands?
form one co-ordinate bond to the central metal ion
What are some monodentate ligands?
H2O, NH3, Cl-, OH-, CN-
What is a bidentate ligand?
form two co-ordinate bonds to the central metal ion
What are some bidentate ligands?
1,2-diaminoethane (H2NCH2CH2NH2) , ethanedioate (C2O42-)
What can you shorten 1,2-diaminoethane to?
en
What are multidentate ligands?
form three or more co-ordinate bonds to the central metal atom
What is an example of a multidentate ligand?
H2EDTA can form the anion EDTA4- which can form 6 bonds with the metal ion and completely surrounds it
What are chelates?
the complexes formed when bidentate or multidentate ligands bond to a central metal ion