Abstract
Single crystals of distrontium copper(II) tetra-hydroxide bis-(tetra-hydroxidoborate), Sr(2)Cu(OH)(4)[B(OH)(4)](2), were obtained by an ammonia evaporation method at room temperature. The compound crystallizes in the triclinic system, space group P1, and is isotypic with the calcium analogue henmilite, Ca(2)Cu(OH)(4)[B(OH)(4)](2). The {Cu(OH)(4)} units form a deformed square lattice in the ac plane, giving rise to a quasi-two-dimensional arrangement of Cu(II) ions. An intricate network of O-H⋯O hydrogen bonds of medium strengths with the [B(OH)(4)] units as the primary donor groups consolidate the framework structure.