Linear, Zigzag, and Helical Cerium(III) Coordination
Polymers
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Abstract
Five novel one-dimensional cerium(III) carboxylate coordination
polymers, [Ce(O<sub>2</sub>CCH<sub>2</sub>CHMe<sub>2</sub>)<sub>3</sub>(EtOH)<sub>2</sub>]<sub><i>n</i></sub> (<b>1</b>),
{[Ce(O<sub>2</sub>CCH<sub>2</sub>Me)<sub>3</sub>(H<sub>2</sub>O)]·0.5(4,4′-bpy)}<sub><i>n</i></sub> (<b>2</b>; 4,4′-bpy = 4,4′-bipyridine),
{[Ce<sub>2</sub>(O<sub>2</sub>CCHMe<sub>2</sub>)<sub>6</sub>(H<sub>2</sub>O)<sub>3</sub>]}<sub><i>n</i></sub> (<b>3</b>), {[Ce<sub>3</sub>(O<sub>2</sub>CCHMe<sub>2</sub>)<sub>9</sub>(<i>n</i>PrOH)<sub>4</sub>]}<sub><i>n</i></sub> (<b>4</b>), and {[Ce<sub>3</sub>(O<sub>2</sub>CCHMe<sub>2</sub>)<sub>9</sub>(HO<sub>2</sub>CCHMe<sub>2</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]·2Me<sub>2</sub>CHCO<sub>2</sub>H}<sub><i>n</i></sub> (<b>5</b>), showcase the surprisingly consistent tendency of Ce(III) coordination
network structures to adopt one-dimensional connection modes. The
type of carboxylate as well as the reaction solvents determines the
exact bridging versus end-on coordination modes for the carboxylates
and, in turn, discriminate between linear, zigzag, and helical arrangements.
Detailed magnetochemical analyses reveal pronounced single-ion effects
and the expected weak antiferromagnetic coupling
