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The ground state term symbol for d7 complexes depends on whether the complex is high spin or low spin. Here's how to determine it:
1. High Spin (Weak Field Ligands):
In a high spin d7 complex, the electrons fill the orbitals according to Hund's rule, maximizing spin multiplicity.
The configuration is t2g^5 eg^2.
S = 3/2 (total spin) and L = 2 (total orbital angular momentum)
The term symbol is ^4F
2. Low Spin (Strong Field Ligands):
In a low spin d7 complex, electrons pair up in the lower energy orbitals before filling the higher energy orbitals.
The configuration is t2g^6 eg^1.
S = 1/2 (total spin) and L = 1 (total orbital angular momentum)
The term symbol is ^2D