Family of Polynuclear Nickel Cagelike Phenylsilsesquioxanes; Features of Periodic Networks and Magnetic Properties

A new family of bi-, tetra-, penta-, and hexanickel cagelike phenylsilsesquioxanes <b>1</b>–<b>6</b> was obtained by self-assembly and transmetalation procedures. Their crystal structures were established by single-crystal X-ray analysis, and features of crystal packing relevant to the network formation were studied by a topological analysis. Compounds <b>1</b>, <b>2</b>, and <b>4</b> are isolated architectures, while <b>3</b>, <b>5</b>, and <b>6</b> present extended 1D and 3D networks. The investigation of magnetic properties revealed the presence of ferro- (<b>1</b> and <b>3</b>–<b>5</b>) or antiferromagnetic (<b>2</b> and <b>6</b>) interactions between Ni­(II) ions, giving rise in the most cases (<b>1</b>, <b>2</b>, and <b>4</b>–<b>6</b>) to the presence of a slow relaxation of the magnetization, which can originate from the spin frustration.