  ```
from pyscf import gto, scf, dft
import numpy as np

# Define molecule with specific atoms and basis
mol = gto.M(
    atom='H 0.75 0.75 0.75; H 0.75 0.75 1.75; H 0.75 1.75 0.75; H 0.75 1.75 1.75; H 1.75 0.75 0.75; H 1.75 0.75 1.75; H 1.75 1.75 0.75; H 1.75 1.75 1.75',
    basis='6-31g'
)

# Perform two state calculations with DFT, storing molecular orbital information into separate chkfiles
mf = dft.RKS(mol)
mf.xc = 'pbe,pbe'
mf.kernel()
mf.chkfile = 'mf.chk'
mf.write()

# Read MO coefficients and occupation numbers from chkfiles
mf = dft.RKS(mol)
mf.chkfile = 'mf.chk'
mf.read()

# Calculate overlap between two determinants
overlap = np.dot(mf.mo_coeff[0], mf.mo_coeff[1].T)

# Construct density matrices
dm1 = np.dot(mf.mo_coeff[0], mf.mo_coeff[0].T)
dm2 = np.dot(mf.mo_coeff[1], mf.mo_coeff[1].T)

# Calculate one-electron and two-electron part contributions
one_electron = np.einsum('ij,ji->', dm1, mf.get_hcore())
two_electron = np.einsum('ijkl,ijkl->', dm2, mf.get_veff())

# Calculate new total energy
new_total_energy = one_electron + two_electron

# Calculate effective electronic coupling
effective_coupling = np.abs(new_total_energy - mf.e_tot)

# Print results
print('Effective electronic coupling:', effective_coupling)

# Remove chkfiles
import os
os.remove('mf.chk')
```