Crystals of the title compound are orthorhombic, space group Pna2(1), with a = 25.155(5) Angstrom, b = 16.080(3) Angstrom, c = 9.027(2) Angstrom, and V = 3651.2(13) Angstrom(3) With Z = 4 and rho(calc) = 1.729 g cm(-3). The structure consists of tribridged Cu4Cl113- tetrameric units that are linked into infinite chains through the formation of bibridged Cu2Cl2 groups. Refinement of 2915 observed reflections (F greater than or equal to 3 sigma(F)) yielded a value of R = 0.0516 and R(w) = 0.0600, Magnetic susceptibility measurements in the range 4-100 K revealed the presence of dominant ferromagnetic coupling at high temperature with the onset of substantially weaker antiferromagnetic coupling at lower temperature. The data are consistent with ferromagnetic coupling within the tetrameric units (Jlk similar to 50 K). The ground states of these units (S = 2) are essentially fully occupied before the antiferromagnetic interactions become significant. These interactions (Jlk similar to -2.6 K) link the units into an effective S = 2 antiferromagnetic chain.