Super–superexchange coupling through a hydrogen bond in a linear copper(II) complex, [Cu(LH)(L)]·BF4·2H2O (LH =N-tert-butyl-N-2-pyridylhydroxylamine)

Crystal structure analysis of the title compound revealed the presence of a hydrogen bond in an intermolecular LH⋯L contact with the O⋯O distance of 2.4252(16) A to form a one-dimensional polymeric structure. Magnetic study clarified that a relatively large exchange coupling was determined as 2J/kB = −33.2(2) K from the Bonner–Fisher analysis and ascribable to the super–superexchange coupling along the Cu–O–H⋯O–Cu path.