Crystal chemistry of inorganic compounds based on chains of oxocentered tetrahedra

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Abstract
The orthorhombic crystal structure of Cu4O2[(As,V)O4]Cl, a = 5.440(1) Å, b = 11.154(2) Å, c = 10.333(2) Å, V = 627.0(3) Å3, Z = 4, Pbcm, has been solved by direct methods and refined to an R(F) index of 0.049 (wR(F 2) = 0.048). The structure is based on unbranched vierer chains {uB, l1 ∞}[O4Cu8] running parallel to the c axis, which are composed of oxocentered tetrahedra [OCu4] linked via opposite edges. The chains are bent by the large chloride ions in zigzag fashion so that the periodicity of the chains is equal to four. [(As,V)O4] groups are located between the puckered chains of oxocentered tetrahedra and crosslink them into layers parallel to the (100) plane, which are held together by the Cu–OAs/v bonds.