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Mono‐ and dinuclear Cu II complexes of the benzyldipicolylamine (BDPA) ligand: crystal structure, synthesis and characterization
Author(s) -
Sivanesan Dharmalingam,
Youn Min Hye,
Park Ki Tae,
Kim Hak Joo,
Grace Andrews Nirmala,
Jeong Soon Kwan
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229617012785
Subject(s) - trifluoromethanesulfonate , chemistry , tetrahydrofuran , crystal structure , hydrogen bond , molecule , copper , ligand (biochemistry) , solvent , crystallography , medicinal chemistry , catalysis , organic chemistry , biochemistry , receptor
The crystal structures of mono‐ and dinuclear Cu II trifluoromethanesulfonate (triflate) complexes with benzyldipicolylamine (BDPA) are described. From equimolar amounts of Cu(triflate) 2 and BDPA, a water‐bound Cu II mononuclear complex, aqua(benzyldipicolylamine‐κ 3 N , N′ , N ′′)bis(trifluoromethanesulfonato‐κ O )copper(II) tetrahydrofuran monosolvate, [Cu(CF 3 SO 3 ) 2 (C 19 H 19 N 3 )(H 2 O)]·C 4 H 8 O, (I), and a triflate‐bridged Cu II dinuclear complex, bis(μ‐trifluoromethanesulfonato‐κ 2 O : O ′)bis[(benzyldipicolylamine‐κ 3 N , N′ , N ′′)(trifluoromethanesulfonato‐κ O )copper(II)], [Cu 2 (CF 3 SO 3 ) 4 (C 19 H 19 N 3 ) 2 ], were synthesized. The presence of residual moisture in the reaction medium afforded water‐bound complex (I), whereas dinuclear complex (II) was synthesized from an anhydrous reaction medium. Single‐crystal X‐ray structure analysis reveals that the Cu II centres adopt slightly distorted octahedral geometries in both complexes. The metal‐bound water molecule in (I) is involved in intermolecular O—H…O hydrogen bonds with triflate ligands and tetrahydrofuran solvent molecules. In (II), weak intermolecular C—H…F(triflate) and C—H…O(triflate) hydrogen bonds stabilize the crystal lattice. Complexes (I) and (II) were also characterized fully using FT–IR and UV–Vis spectroscopy, cyclic voltammetry and elemental analysis.