Coordination Compound Flashcards
(25 cards)
What is a coordination compound?
A compound with a central metal atom/ion bonded to surrounding ligands via coordinate bonds.
What is a ligand?
An ion or molecule that donates a lone pair to a metal ion to form a coordinate bond.
Give an example of a monodentate ligand.
Cl⁻, NH₃, H₂O.
Name a common bidentate ligand.
Ethylenediamine (en).
What is the coordination number in [Cr(NH₃)₆]³⁺?
6.
What is the oxidation number of Fe in [Fe(CN)₆]⁴⁻?
+2.
What does Werner’s theory explain?
It explains primary and secondary valencies in coordination compounds.
What is chelation?
The formation of stable ring structures by multidentate ligands with a metal ion.
How do you name [Cu(NH₃)₄]SO₄?
Tetraamminecopper(II) sulfate.
Name an ambidentate ligand.
NO₂⁻ (can bind via N or O).
Name two types of isomerism in coordination compounds.
Geometrical and Optical.
Which complex shows cis-trans isomerism: [Pt(NH₃)₂Cl₂] or [Ni(CO)₄]?
[Pt(NH₃)₂Cl₂].
Which complex can show optical isomerism?
[Co(en)₃]³⁺.
What is linkage isomerism?
Isomerism due to ligands coordinating through different atoms (e.g., NO₂⁻ via N or O).
Give an example of ionisation isomerism.
[Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br.
What is the crystal field splitting pattern in octahedral complexes?
Splits d-orbitals into t₂g (lower) and e_g (higher) sets.
Is splitting greater in tetrahedral or octahedral fields?
Octahedral.
What determines high or low spin in octahedral complexes?
Strength of the ligand (weak-field = high spin, strong-field = low spin).
Arrange these in order of increasing field strength: I⁻ < H₂O < CN⁻
I⁻ < H₂O < CN⁻
What kind of complexes show Jahn-Teller distortion?
d⁹ and sometimes d⁴ high-spin octahedral complexes.
What is the electronic configuration of Fe²⁺ in [Fe(CN)₆]⁴⁻?
Low spin: t₂g⁶e_g⁰.
What is the magnetic moment formula?
μ = √(n(n+2)) BM, where n = number of unpaired electrons.
What is the trans effect?
The ability of a ligand to direct substitution to the ligand trans to itself.
Name one type of substitution mechanism.
Associative (A), Dissociative (D), or Interchange (I).
