μ-Carbonato-κ(4) O,O':O',O''-bis-{[2'-(di-tert-butyl-phosphan-yl)biphenyl-2-yl-κ(2) P,C (1)]palladium(II)} dichloro-methane monosolvate.

The title compound, [(μ2-CO3){Pd(P(t-C4H9)2(C12H8)}2]·CH2Cl2, the first CO3-bridged palladium dimer complex reported to date, was obtained while preparing the Pd(0) complex with (2-biphen-yl)P( (t) Bu)2. In the crystal, each palladium dimer is accompanied by a dichloro-methane solvent mol-ecule. Coordination of the carbonate and chelated phosphane ligands gives distorted square-planar environments at the Pd atoms. Important geometrical parameters include Pd-P(av.) = 2.2135†(4)†à , Pd-C(av.) = 1.9648†(16)†à and P-Pd-C = 84.05†(5) and 87.98†(5)°, and O-Pd-O' = 60.56†(4) and 61.13†(4)°. Bonding with the carbonate O atoms shows values of 2.1616†(11) and 2.1452†(11)†à for the Pd-O-Pd bridge, whereas other Pd-O distances are slightly longer at 2.2136†(11) and 2.1946†(11)†à . One of the tert-butyl groups is disordered over two set of sites with an occupancy ratio of 0.723†(6):0.277†(6). Weak C-H⋯O interactions are observed propagating the molecules along the [100] direction.