The new three-dimensional supramolecule bis{μ-2-[(4-hydroxybenzoyl)hydrazonomethyl]phenolato}bis[aquacopper(II)] dinitrate

Abstract

In the title centrosymmetric binuclear complex, [Cu(2)(C(14)H(11)N(2)O(3))(2)(H(2)O)(2)](NO(3))(2), the two metal centres are bridged by the phenolate O atoms of the ligand, forming a Cu(2)O(2) quadrangle. Each Cu atom has a distorted square-pyramidal geometry, with the basal donor atoms coming from the O,N,O'-tridentate ligand and a symmetry-related phenolate O atom. The more weakly bound apical donor O atom is supplied by a coordinated water molecule. When a further weak Cu...O interaction with the 4-hydroxy O atom of a neighbouring cation is considered, the extended coordination sphere of the Cu atom can be described as distorted octahedral. This interaction leads to two-dimensional layers, which extend parallel to the (100) direction. The two-dimensional polymeric structure contrasts with other reported structures involving salicylaldehyde benzoylhydrazone ligands, which are usually discrete mono- or dinuclear Cu complexes. The nitrate anions are involved in a three-dimensional hydrogen-bonding network, featuring intermolecular N-H...O and O-H...O hydrogen bonds.

Versatile binding properties of a di-2-pyridyl ketone nicotinoylhydrazone ligand: Crystal structure of a Cu(II) complex

“…A very strong and sharp band located at 1579 cm −1 is assigned to the (C N) stretching vibrations of azomethine of the ligand. This band is shifted to lower wavenumber on complexation with the metal [28], which supports the participation of azomethine group of the ligand in binding to the Cu(II) ion and is consistent with the X-ray diffraction studies in complex 1a. A shift to the higher frequency of the (N-N) band and the appearance of a new band due to (C N) may be taken as additional evidence for the participation of the imine nitrogen [28].…”

Dioxomolybdenum(vi) and dioxotungsten(vi) complexes chelated with the ONO tridentate hydrazone ligand: synthesis, structure and catalytic epoxidation activity

“…Some examples of structurally characterized compounds are [Sn(L H )(Ph) 2 ]ÁEtOH, 9 [Cd(HL 4OMe ) 2 ], 10 [Cu 2 (L 4OMe ) 2 (py) 2 ], 11 and [Cu 2 (HL H ) 2 (H 2 O) 2 ](NO 3 ) 2 . 12 In these complexes, the hydrazone ligand is in the singly-deprotonated (HL) À or doublydeprotonated (L) 2À form.…”

Cobalt(iii) complexes with tridentate hydrazone ligands: protonation state and hydrogen bond competition

“…[18][19][20][21][22] Metal complexes with aroylhydrazone ligands ArC]N-NH-(C]O)-R are usually mononuclear or dinuclear. Some examples of structurally characterized complexes are [Sn(L)(Ph) 2 ]$EtOH, 23 [Cd(HL) 2 ], 24 [Cu 2 (L) 2 (py) 2 ], 25 [Cu 2 (HL) 2 (H 2 O) 2 ](NO 3 ) 2 , 26 [Co(HL) 2 ]-ClO 4 $H 2 O$CH 3 CN, 27 [Co(L) 2 ] 2 [Co(H 2 O) 4 (OPPh 3 ) 2 ], 28 [Co(L) 2 ]Cl, 29 [Co(L) 2 ]$H 2 O, 30 or [Co(L)(HL) 2 ](NO 3 ) 2 $H 2 O$CH 3 OH. 31 In these compounds, the hydrazone ligand is in the singly-deprotonated HL À , or in doubly-deprotonated L 2À form, Scheme 1.…”