Diaquabis(ethylenediamine)copper(II) bis(4-nitrobenzoate)

Abstract

In the title compound, [Cu(C2H8N2)2(H2O)2](C7H4NO4)2, the component complex cations and organic anions inter­act by way of N—H⋯O and O—H⋯O hydrogen bonds, leading to a layered structure. The Cu atom has site symmetry .

Diaquabis(ethylenediamine-κ2N,N′)copper(II) 2,2′-dithiodinicotinate sesquihydrate

“…In the crystal structure of the title compound, (I), the Cu(II) ions are coordinated by four N atoms of en ligands, forming a slightly distorted square plane. The Cu-N distances of 2.005 (2), 2.016 (2), 2.025 (2), and 2.015 (2)Å are comparable to those in other ethylenediamine-copper(II) complexes, such as trans-Bis(ethylenediamine)bis(p-nitrobenzoxasulfamato)copper(II) (Kazak et al, 2004), Diaquabis(ethylenediamine) copper(II) bis(4-nitrobenzoate) (Harrison et al, 2007), The coordination sphere of the Cu(II)ions is completed by two longer contacts to two symmetry equivalent aqua ligands located above and below the tetragonal plane. The Cu-Ow distances of 2.702 (2)Å (Cu1-O1) and 2.499 (2)Å (Cu2-O2) are strongly elongated due to Jahn-Teller distortion and the coordination polyhedra around the Cu(II) ions can be described as significantly distorted octahedral.…”

Controlling the ligating behaviour of biologically important p-hydroxybenzoate towards copper(II) by the use of nitrogen bases: Synthesis, characterization and single crystal X-ray structure determination of [trans-Cu(en)2(H2O)2](L1)2·2H2O and [cis-Cu(L1)2(L2)2] where en=ethylenediamine, L1=p-hydroxybenzoate, L2=3-picoline

“…For complex salt 1 the strong absorption around 548 nm is observed due to the d-d transition typical for octahedral copper(II) complex of the type [trans-Cu(en) 2 (H 2 O) 2 ] 2+ . In our earlier studies on copper(II) complexes with sulphonates [16], p-nitrobenzoate [17], ibuprofenate, o-methoxybenzoate and p-ethoxybenzoate [18] the k max values around 540 nm were observed when [trans-Cu(en) 2 (H 2 O) 2 ](carboxylate) 2 type complexes were formed. Therefore the ionic form, [trans-Cu (en) 2 (H 2 O) 2 ](L 1 ) 2 Á 2H 2 O of compound 1 is indicated and neutral form, [Cu(en) 2 (L 1 ) 2 ] Á 2H 2 O is ruled out.…”

trans-Diaquabis(ethylenediamine-κ2N,N′)copper(II) bis[3-(3-pyridyl)propionate] dihydrate

“…For general background, see : Hathaway & Hodgson (1973); Bernstein et al (1995); Janiak (2000); Jeffrey (1997) Emsley et al (1988Emsley et al ( , 1990; Li et al (2005); Gonzalez-Alvarez et al (2003); Lee et al (2005); Mahadevan et al (1986); Kovbasyuk et al (1997); Harrison et al (2007).…”

“…propionate anions and N-H···O hydrogen bonds of amine H atoms form the R 2 1 (6) and R 2 2 (8) ring motifs (Bernstein et al, 1995 (Lee et al, 2005); X = 4-fluorobenzoate (Liu et al, 2004), X = isonicotinate (Segla et al, 2000) and X = 4-nitrobenzoate (Harrison et al, 2007)]. On the other hand, the R 2 1 (6) ring motifs are reported for [Cu(en) 2 (H 2 O) 2 ]X 2 complexes, [where X = naphthalene-2-sulfonate (Sharma et al, 2005) and X = 2,6-dimethoxynicotinate (Jašková et al, 2007) (Fig.…”