Copper(2+) Complexes of Hydroxyoxidoborates. Synthesis and Characterization of Two Clusters Containing the Hexaborate(2-) Ligand: [Cu(NH2CH2CH2NEt2){B6O7(OH)6}]•5H2O and [Cu(NH3)2{B6O7(OH)6}]•2H2O

[Cu(NH2CH2CH2NEt2){B6O7(OH)(6)}]5H(2)O (1) and [Cu(NH3)(2){B6O7(OH)(6)}]2H(2)O (2) have been obtained as crystalline materials from aqueous solutions of Dynamic Combinatorial Libraries (DCLs) originating from B(OH)(3) and appropriate Cu(II) amine complexes. These two Cu/O/B clusters are formed through self-assembly processes and contain tridentate hexaborate(2-)-O-3 ligands. Both compounds have been characterized by TGA/DSC, magnetic susceptibility measurements, IR spectroscopy, and single-crystal XRD studies. The intermolecular H-bond interactions between neighbouring hexaborate units are implicated in their templated synthesis. Compound 2 is a coordination polymer and stabilization is also gained through formation of an additional O-Cu coordinate bond. Steric congestion in 1 blocks formation of this bond resulting in insular complexes.