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Solvent‐mediated structural transformations of copper(II) coordination polymers induced by different short‐chain alcohols
Author(s) -
Ming Mei,
Shi Jun
Publication year - 2019
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520618017481
Subject(s) - copper , chain (unit) , solvent , polymer , chemistry , polymer chemistry , organic chemistry , physics , astronomy
A three‐dimensional copper(II) coordination polymer (CP), {Cu(L‐F)(N 3 )} n (1), was synthesized by reacting Cu(NO 3 ) 2 with 5‐fluoronicotinic acid (HL‐F) and NaN 3 in a water medium. Complex (1) shows a 3D network, in which the 1D [Cu 2 (COO)N 3 ] n chains are interconnected via L‐F ligands. By immersing (1) into different short‐chain alcohols (CH 3 OH, C 2 H 5 OH and HOC 2 H 4 OH), three different CPs were isolated, including {Cu 3 (L‐F) 4 (N 3 ) 2 (CH 3 OH) 2 } n (2), {Cu 3 (L‐F) 4 (N 3 ) 2 (C 2 H 5 OH) 2 } n (3) and {Cu 2.5 (L‐F) 3 (N 3 ) 2 (HOC 2 H 4 OH) 0.5 } n (4). CPs (2) and (3) display a similar structure, in which trinuclear subunit [Cu 3 (COO) 2 (N 3 ) 2 (solvent) 2 ] is generated. Furthermore, such entities are interconnected via L‐F ligands to give rise to a 3D network. As for (4), there are trinuclear [Cu 3 (COO) 2 (N 3 ) 2 ] and binuclear [Cu 2 (COO)N 3 ] units, which are interconnected by L‐F ligands to generate a 3D network. Notably, in (2) and (3), the coordination modes of CH 3 OH and C 2 H 5 OH solvents are monodentate; whereas for (4), the HOC 2 H 4 OH solvent adopts a bridging mode to link two Cu atoms. Of further interest, these processes are solvent‐mediated structural transformations, with obvious colour changes in the crystals. Structural changes and mechanisms of transformation are discussed in detail.