Top 50 Most Important Coordination Compounds for JEE

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Top 50 Coordination Compounds

The definitive JEE dataset. Memorize the geometry, spin states, magnetic moments, and colors of the most frequently tested coordination complexes.

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1. Iron (Fe) Complexes

$$\ce{[Fe(CN)6]^4-}$$

Hexacyanidoferrate(II) / Ferrocyanide

Oxidation State+2 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment0 BM

ColorPale Yellow

$$\ce{[Fe(CN)6]^3-}$$

Hexacyanidoferrate(III) / Ferricyanide

Oxidation State+3 ($3d^5$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment1.73 BM

ColorRed

$$\ce{[Fe(H2O)6]^3+}$$

Hexaaquairon(III)

Oxidation State+3 ($3d^5$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment5.92 BM

ColorPale Purple / Yellow

$$\ce{[Fe(H2O)6]^2+}$$

Hexaaquairon(II)

Oxidation State+2 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment4.90 BM

ColorPale Green

$$\ce{[Fe(H2O)5(NO)]^2+}$$

Pentaaquanitrosoniumiron(I) (Brown Ring)

Oxidation State+1 ($3d^7$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorBrown

$$\ce{[Fe(SCN)(H2O)5]^2+}$$

Pentaaquathiocyanato-S-iron(III)

Oxidation State+3 ($3d^5$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment5.92 BM

ColorBlood Red

$$\ce{[Fe(C2O4)3]^3-}$$

Trioxalatoferrate(III)

Oxidation State+3 ($3d^5$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment5.92 BM

ColorEmerald Green

$$\ce{Fe4[Fe(CN)6]3}$$

Iron(III) hexacyanoferrate(II) (Prussian Blue)

Oxidation State+3 (out), +2 (in)

Coordination No.6

GeometryLattice

Spin StateMixed

Magnetic MomentParamagnetic

ColorDeep Blue

2. Cobalt (Co) Complexes

$$\ce{[Co(NH3)6]^3+}$$

Hexaamminecobalt(III)

Oxidation State+3 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment0 BM

ColorYellow / Orange

$$\ce{[Co(H2O)6]^2+}$$

Hexaaquacobalt(II)

Oxidation State+2 ($3d^7$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorPink

$$\ce{[Co(en)3]^3+}$$

Tris(ethylenediamine)cobalt(III)

Oxidation State+3 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment0 BM

ColorYellow (Opt. Active)

$$\ce{[Co(C2O4)3]^3-}$$

Trioxalatocobaltate(III)

Oxidation State+3 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin (Exception)

Magnetic Moment0 BM

ColorDark Green

$$\ce{[CoF6]^3-}$$

Hexafluoridocobaltate(III)

Oxidation State+3 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment4.90 BM

ColorGreen

$$\ce{[CoCl4]^2-}$$

Tetrachloridocobaltate(II)

Oxidation State+2 ($3d^7$)

Coordination No.4

GeometryTetrahedral

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorDeep Blue

$$\ce{[Co(SCN)4]^2-}$$

Tetrathiocyanato-S-cobaltate(II)

Oxidation State+2 ($3d^7$)

Coordination No.4

GeometryTetrahedral

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorCobalt Blue

$$\ce{[Co(NO2)6]^3-}$$

Hexanitrito-N-cobaltate(III)

Oxidation State+3 ($3d^6$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment0 BM

ColorYellow

3. Nickel (Ni) Complexes

$$\ce{[Ni(CO)4]}$$

Tetracarbonylnickel(0)

Oxidation State0 ($4s^2 3d^8 \rightarrow 3d^{10}$)

Coordination No.4

GeometryTetrahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Ni(CN)4]^2-}$$

Tetracyanidonickelate(II)

Oxidation State+2 ($3d^8$)

Coordination No.4

GeometrySquare Planar ($dsp^2$)

Spin StateLow Spin

Magnetic Moment0 BM

ColorYellow

$$\ce{[NiCl4]^2-}$$

Tetrachloridonickelate(II)

Oxidation State+2 ($3d^8$)

Coordination No.4

GeometryTetrahedral ($sp^3$)

Spin StateHigh Spin

Magnetic Moment2.83 BM

ColorGreen

$$\ce{[Ni(H2O)6]^2+}$$

Hexaaquanickel(II)

Oxidation State+2 ($3d^8$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment2.83 BM

ColorGreen

$$\ce{[Ni(NH3)6]^2+}$$

Hexaamminenickel(II)

Oxidation State+2 ($3d^8$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin (Ammonia is borderline)

Magnetic Moment2.83 BM

ColorBlue

$$\ce{[Ni(en)3]^2+}$$

Tris(ethylenediamine)nickel(II)

Oxidation State+2 ($3d^8$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment2.83 BM

ColorViolet

$$\ce{[Ni(dmg)2]}$$

Bis(dimethylglyoximato)nickel(II)

Oxidation State+2 ($3d^8$)

Coordination No.4

GeometrySquare Planar

Spin StateLow Spin (Chelate+H-Bond)

Magnetic Moment0 BM

ColorRosy Red

4. Copper (Cu) & Zinc (Zn) Complexes

$$\ce{[Cu(H2O)6]^2+}$$

Hexaaquacopper(II)

Oxidation State+2 ($3d^9$)

Coordination No.6

GeometryDistorted Octahedral

Spin StateHigh Spin

Magnetic Moment1.73 BM

ColorPale Blue

$$\ce{[Cu(NH3)4]^2+}$$

Tetraamminecopper(II)

Oxidation State+2 ($3d^9$)

Coordination No.4

GeometrySquare Planar ($dsp^2$)

Spin StateHigh Spin

Magnetic Moment1.73 BM

ColorDeep Blue / Violet

$$\ce{[CuCl4]^2-}$$

Tetrachloridocuprate(II)

Oxidation State+2 ($3d^9$)

Coordination No.4

GeometryDistorted Tetrahedral

Spin StateHigh Spin

Magnetic Moment1.73 BM

ColorYellow / Green

$$\ce{[Cu(CN)4]^3-}$$

Tetracyanidocuprate(I)

Oxidation State+1 ($3d^{10}$)

Coordination No.4

GeometryTetrahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Zn(H2O)6]^2+}$$

Hexaaquazinc(II)

Oxidation State+2 ($3d^{10}$)

Coordination No.6

GeometryOctahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Zn(NH3)4]^2+}$$

Tetraamminezinc(II)

Oxidation State+2 ($3d^{10}$)

Coordination No.4

GeometryTetrahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Zn(OH)4]^2-}$$

Tetrahydroxidozincate(II)

Oxidation State+2 ($3d^{10}$)

Coordination No.4

GeometryTetrahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Cd(NH3)4]^2+}$$

Tetraamminecadmium(II)

Oxidation State+2 ($4d^{10}$)

Coordination No.4

GeometryTetrahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[HgI4]^2-}$$

Tetraiodidomercurate(II) (Nessler's)

Oxidation State+2 ($5d^{10}$)

Coordination No.4

GeometryTetrahedral

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorPale Yellow

5. Chromium (Cr) & Manganese (Mn)

$$\ce{[Cr(H2O)6]^3+}$$

Hexaaquachromium(III)

Oxidation State+3 ($3d^3$)

Coordination No.6

GeometryOctahedral (Inner)

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorViolet

$$\ce{[Cr(NH3)6]^3+}$$

Hexaamminechromium(III)

Oxidation State+3 ($3d^3$)

Coordination No.6

GeometryOctahedral (Inner)

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorYellow

$$\ce{[CrCl2(H2O)4]^+ }$$

Tetraaquadichloridochromium(III)

Oxidation State+3 ($3d^3$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorGreen

$$\ce{[Cr(C2O4)3]^3-}$$

Trioxalatochromate(III)

Oxidation State+3 ($3d^3$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment3.87 BM

ColorGreen

$$\ce{[Mn(H2O)6]^2+}$$

Hexaaquamanganese(II)

Oxidation State+2 ($3d^5$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment5.92 BM

ColorPale Pink

$$\ce{[Mn(CN)6]^4-}$$

Hexacyanidomanganate(II)

Oxidation State+2 ($3d^5$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment1.73 BM

ColorBlue

$$\ce{[Mn(CN)6]^3-}$$

Hexacyanidomanganate(III)

Oxidation State+3 ($3d^4$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment2.83 BM

ColorRed

$$\ce{[Mn(H2O)6]^3+}$$

Hexaaquamanganese(III)

Oxidation State+3 ($3d^4$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin

Magnetic Moment4.90 BM

ColorViolet

$$\ce{[Cr(en)3]^3+}$$

Tris(ethylenediamine)chromium(III)

Oxidation State+3 ($3d^3$)

Coordination No.6

GeometryOctahedral

Spin StateHigh Spin (Inner)

Magnetic Moment3.87 BM

ColorYellow

6. Silver, Platinum, & Palladium (4d/5d)

$$\ce{[Ag(NH3)2]+}$$

Diamminesilver(I) (Tollens' Reagent)

Oxidation State+1 ($4d^{10}$)

Coordination No.2

GeometryLinear

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Ag(CN)2]-}$$

Dicyanidosilver(I)

Oxidation State+1 ($4d^{10}$)

Coordination No.2

GeometryLinear

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[Au(CN)2]-}$$

Dicyanidoaurate(I)

Oxidation State+1 ($5d^{10}$)

Coordination No.2

GeometryLinear

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

$$\ce{[PtCl4]^2-}$$

Tetrachloridoplatinate(II)

Oxidation State+2 ($5d^8$)

Coordination No.4

GeometrySquare Planar

Spin StateLow Spin (5d Exception)

Magnetic Moment0 BM

ColorRed

$$\ce{cis-[PtCl2(NH3)2]}$$

cis-Diamminedichloridoplatinum(II) (Cisplatin)

Oxidation State+2 ($5d^8$)

Coordination No.4

GeometrySquare Planar

Spin StateLow Spin

Magnetic Moment0 BM

ColorYellow

$$\ce{[PdCl4]^2-}$$

Tetrachloridopalladate(II)

Oxidation State+2 ($4d^8$)

Coordination No.4

GeometrySquare Planar

Spin StateLow Spin (4d Exception)

Magnetic Moment0 BM

ColorBrown

$$\ce{[Pt(NH3)4]^2+}$$

Tetraammineplatinum(II)

Oxidation State+2 ($5d^8$)

Coordination No.4

GeometrySquare Planar

Spin StateLow Spin

Magnetic Moment0 BM

ColorColorless

$$\ce{[PtCl6]^2-}$$

Hexachloridoplatinate(IV)

Oxidation State+4 ($5d^6$)

Coordination No.6

GeometryOctahedral

Spin StateLow Spin

Magnetic Moment0 BM

ColorYellow

$$\ce{[Ag(S2O3)2]^3-}$$

Bis(thiosulfato)argentate(I)

Oxidation State+1 ($4d^{10}$)

Coordination No.2 (or 4)

GeometryLinear (primarily)

Spin StateDiamagnetic ($d^{10}$)

Magnetic Moment0 BM

ColorColorless

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