Family of Polynuclear Nickel Cagelike Phenylsilsesquioxanes; Features of Periodic Networks and Magnetic Properties
2017-10-19T14:51:16Z (GMT)
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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.
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