First Optically Active Phosphapalladacycle Bearing a Phosphorus Atom in an Axially Chiral Environment

Optimization of atomic density-fitting basis functions for molecular two-electron integral approximations

A general procedure for the optimization of atomic density-fitting basis functions is designed with the balance between accuracy and numerical stability in mind. Given one-electron wavefunctions and energies, weights are assigned to the product densities, modeling their contribution to the exchange and second-order correlation energy, and a simple weighted error measure is minimized. Generally contracted Gaussian auxiliary basis sets are optimized to match the wavefunction basis sets [D. N. Laikov, Theor. Chem. Acc. 138, 40 (2019)] for all 102 elements in a scalar-relativistic approximation [D. N. Laikov, J. Chem. Phys. 150, 061103 (2019)].

Di-μ-chlorido-bis-({8-[bis-(naphthalen-1-yl)phosphan-yl]naphthalen-1-yl-κ(2) C (1),P}palladium(II)) dichloro-methane disolvate

The title compound, [Pd2{P(C10H7)2(C10H6)}2Cl2]·2CH2Cl2, shows cyclo-metalation of one naphthalen-1-yl substituent of each of the phosphane ligands to the Pd dimer in a trans orientation; the complete dimer is generated by a centre of inversion. Two dichloro-methane solvent mol-ecules create C-H⋯Cl inter-actions with the metal complex, generating supermolecular layers in the ab plane. Additional C-H⋯π and π-π [centroid-centroid distances = 3.713 (3), 3.850 (4) and 3.926 (3) Å] inter-actions join these planes into a three-dimensional supermolecular network.