"Low-spin" configurations occur when d electrons are promoted to the p orbital, while "high-spin" configurations occur when d electrons remain in the d subshell.

"Low-spin" configurations occur when d electrons are promoted to the s orbital, while "high-spin" configurations occur when d electrons remain in the d subshell.

"Low-spin" configurations occur when d electrons are preferentially unpaired, while "high-spin" configurations occur when d electrons are preferentially paired.

"Low-spin" configurations occur when d electrons are preferentially paired, while "high-spin" configurations occur when d electrons are preferentially unpaired.

"Low-spin" configurations occur when d electrons remain in the d subshell, while "high-spin" configurations occur when d electrons are promoted to the s orbital.

[Cu(CO)]²⁺

[Cu(OH₂)(CO)₅]²⁺

[Cu(OH₂)₂(CO)₄]²⁺

[Cu(CO)₆]²⁺

Only observed for TM complexes with two or more unpaired d electrons.

Only observed for TM complexes with one or more unpaired d electrons.

Only observed for TM complexes with a 'high-spin' configuration.

Only observed for TM complexes with zero unpaired d electrons.

hexamminecobalt(III) platinum(II) tetrachloride

hexamminecobalt(III) tetrachloridoplatinate(II)

cobalt(II) hexammine tetrachloridoplatinate(II)

cobalt(III) hexammine tetrachloridoplatinate(II)

3d⁸

4s²3d⁶

3d⁶

3d⁴

Titanium and Copper

Zirconium and Zinc

Titanium and Silver

Titanium and Gold

III, I, II, IV

I, III, II, IV

IV, III, I, II

II, I, III, IV

They contain only sp³ hybridised carbon atoms that form a double bond.

They contain only sp² hybridised carbon atoms that form a triple bond.

They contain two sp hybridised carbon atoms that form a double bond.

They contain two sp² hybridised carbon atoms that form a double bond.

D

A

C

B