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Three helical chain-based 3D coordination polymers: solvent-induced syntheses, tunable structures and catalytic properties for the Strecker reaction

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Abstract

Three three-dimensional (3D) helical chain-based coordination polymers [Sc(aip)(OH)·(H2O)]n (1), [Sc2(aip)3]n (2) and [Sc2(nip)3]n (3) (H2aip = 5-aminoisophthalic acid, H2nip = 5-nitroisophthalic acid) have been synthesized through solvent induction without any chiral auxiliary systematically. We first synthesized CP 1, a 3D network, which contains intertwined left- and right-hand helical chains {–ScO6–OH–}n. By changing the polarity of the solvents from CH3CN/H2O to H2O, a genuine single helix of 2 was constructed, in which adjacent Sc(COO)6 polyhedra are connected alternately by aip2− ligands to form a 3D framework with intertwined parallel left-hand helical chains {–Sc1(COO)–Sc2(COO)–}n. Then by changing the substituent of the ligand, CP 3 was obtained with right-handed helical chains. As for 3, the aip2− ligands bridge Sc(III) ions alternately into infinite right-handed helical chains {–Sc(COO)–}n, which serve as secondary building units (SBU) to generate a 3D framework. Solid-state circular dichroism spectrum confirms that 3 is optically active. We also studied the catalytic properties of 1–3 in the Strecker reaction. Importantly, 1 shows excellent catalytic activity under mild conditions and can be reused at least four times without significant reduction in catalytic ability.

Graphical abstract: Three helical chain-based 3D coordination polymers: solvent-induced syntheses, tunable structures and catalytic properties for the Strecker reaction

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Publication details

The article was received on 23 Jun 2019, accepted on 02 Aug 2019 and first published on 02 Aug 2019


Article type: Paper
DOI: 10.1039/C9CE00972H
CrystEngComm, 2019, Advance Article

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    Three helical chain-based 3D coordination polymers: solvent-induced syntheses, tunable structures and catalytic properties for the Strecker reaction

    J. Chai, P. Zhang, X. Shi, J. Sun, L. Wang and Y. Fan, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE00972H

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