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What does the Coordination Compounds revision sheet cover?

What a Coordination Compound Is, Types of Ligands, Double Salt versus Coordination Complex, Terms and Classification, IUPAC Nomenclature, the Rules in Order, total electron count around the metal centre, Effective Atomic Number (EAN) Rule, EAN equals electrons on the metal ion plus electrons donated by all ligands, Z: atomic number of the metal. X: electrons lost by the metal to form the ion. Y: electrons donated by the ligands, Homoleptic/Heteroleptic and Charge-Type, One More Pass, Structural isomers: same formula, different bonding, Stereoisomers: same bonds, different arrangement.

Is this for Class 12 Maharashtra HSC Chemistry?

Yes, it is written for the Maharashtra HSC Chemistry syllabus.

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Coordination Compounds — Class 12 Maharashtra HSC Chemistry revision notes

A 7-page visual revision sheet for Coordination Compounds, written for Class 12 Maharashtra HSC Chemistry. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

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Coordination Compounds in one look

a metal in the middle, ligands donating a pair each, and one number that fixes the shape

What a Coordination Compound Is

a central metal atom or ion is surrounded by ligands, linked through coordinate bonds
a coordinate bond: the shared electron pair comes entirely from the ligand
drawn conventionally as an arrow pointing to the electron acceptor
metal ion (electron-deficient) is the acceptor, the Lewis acid
ligand (electron-pair donor) is the Lewis base
forming a complex is a Lewis acid-base interaction
cisplatin Pt(NH_3)_2Cl_2: Pt surrounded by 2 NH_3 and 2 Cl^-
all four donate a lone pair to the central Pt(II)

Types of Ligands

monodentate: one donor atom shares an electron pair, e.g. Cl^-, OH^-, CN^-
polydentate: two or more donor atoms bind the same metal
en and oxalate are bidentate: two donor atoms each
EDTA^4- binds via 4 O and 2 N: hexadentate on its own
ambidentate: two different donor atoms, uses either one, never both
-NO_2 links through N, -ONO through O
-SCN links through S, -NCS through N

Double Salt versus Coordination Complex

double salt dissociates completely into simple ions in water
Mohr's salt FeSO_4(NH_4)_2SO_4.6H_2O gives Fe^2+, NH_4^+, SO_4^2-
carnallite KCl.MgCl_2.6H_2O behaves the same way
coordination complex: at least one complex ion survives dissociation intact
K_4[Fe(CN)_6] gives 4K^+ and [Fe(CN)_6]^4-, which does not fall apart
the test is chemical, not just naming
dissolved [Co(NH_3)_6]Cl_3 gives no test for free Co^3+ or NH_3
but AgNO_3 still precipitates all 3 moles of ionisable Cl^- as AgCl

Q. K_4[Fe(CN)_6]: find the charge number of the complex ion and the oxidation state of Fe.

the coordination sphere [Fe(CN)_6] balances the charge of 4 K^+ outside it
so the complex ion is [Fe(CN)_6]^4-
charge of complex = O.S. of Fe + 6×(charge of CN^-) = O.S.(Fe) - 6
-4 = O.S. of Fe - 6, so O.S. of Fe = -4 + 6

Answer: charge number of the complex ion is -4, oxidation state of Fe is +2

Page 1 of 7. The full sheet, all 7 pages, opens free in the app.

What this Coordination Compounds sheet covers

What a Coordination Compound Is
Types of Ligands
Double Salt versus Coordination Complex
Terms and Classification
IUPAC Nomenclature, the Rules in Order
total electron count around the metal centre
Effective Atomic Number (EAN) Rule
EAN equals electrons on the metal ion plus electrons donated by all ligands
Z: atomic number of the metal. X: electrons lost by the metal to form the ion. Y: electrons donated by the ligands
Homoleptic/Heteroleptic and Charge-Type, One More Pass
Structural isomers: same formula, different bonding
Stereoisomers: same bonds, different arrangement
Geometric Isomers (Diastereomers)
Optical Isomers (Enantiomers)
thermodynamic stability of a complex
Stability Constant
equilibrium: M^a+ + nL^x- rightleftharpoons [ML_n]^a+-nx
What Governs Stability
Valence Bond Theory: the Steps
Tetrahedral vs Square Planar, Both C.N. 4
Tetrahedral, e.g. [NiCl4]2-
Square planar, e.g. [Ni(CN)4]2-
Limits of VBT
Crystal Field Theory, Octahedral Field
Spectrochemical Series and Spin
Tetrahedral Field and Colour
Applications
Traps that cost marks
Tricks that save time

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