{N,N′-Bis[3-(2-nitrophenyl)prop-2-enylidene]ethylenediamine-κ²N,N′}chlorido(triphenylphosphine-κP)copper(I)

Abstract

The title complex, [CuCl(C20H18N4O4)(C18H15P)], has two molecules in the asymmetric unit. The Cu atom is four‐coordinate in a distorted tetrahedral geometry, bonded to two imine N atoms of the Schiff base, Cl and PPh3; the main distortion is the small bite angle of the chelating Schiff base ligand. One triphenylphospine ligand adopts an approximate propeller conformation, with dihedral angles of 69.36 (14), 77.02 (12) and 82.44 (15)° for pairs of benzene rings, the normals of which make angles of 37.8, 65.4 and 72.6° with the P—Cu bond; the arrangement in the other triphenylphosphine ligand is rather less symmetrical, with dihedral angles of 63.41 (15), 70.67 (12) and 78.11 (12)° and angles of 20.3, 78.6 and 83.2° between the ring plane normals and the P—Cu bond. There are intermolecular C—H...Cl and C—H...O interactions. The crystal was a non‐merohedral twin, with approximately equal contributions of the two domains.

Synthesis and Structural Characterization of Copper(I), Silver(I) and Gold(I) Complexes with Pyrimidine‐2‐thionato Ligands and their Adducts with Phosphanes

“…The Cu–N bond length of 2.1819(19) Å is also quite similar to those reported for several copper(I) complexes4c,55–57 with a tetrahedral coordination environment for the metal atom. The two Cu–P bond lengths are slightly different to one another [2.2513(6) Å for Cu(1)–P(1) and 2.21976(6) Å for Cu(1)–P(2)#1]; both of these values are quite similar to those reported [2.1730(11)–2.3093(7) Å]48,54,58–60 for similar copper(I) complexes.…”

Synthesis, characterization and crystal structures of the bidentate Schiff baseN,N′-bis(2-nitrocinnamaldehyde)ethylenediamine and its complex with CuNCS and triphenylphosphane

“…Apart from this particular feature, the bond lengths and angles within the ligands in these complexes remain essentially constant (discounting a small number of outliers, which are likely to be a consequence of reported or unresolved disorder), while there is a range of deviations from planarity of the conjugated chain-ring-nitro units. For the 14 previously reported tetrahedral copper complexes of (1) (six complexes) (Habibi, Lalegani et al, 2007a;Kickelbick et al, 2002Kickelbick et al, , 2003 and (3) (eight complexes) (Habibi, Montazerozohori et al, 2007;Dehghanpour, Kempe et al, 2006;Habibi, Lalegani et al, 2007a,b,c;Kickelbick et al, 2002), the range of Cu-N bond lengths is 2.009-2.127 Å , with a mean of 2.079 Å , which compares well with the distances of 2.109 3 (Sheldrick, 2008b); program(s) used to refine structure:…”

“…In this paper, we report the synthesis, spectroscopic characterization and crystallographic structural study of the Schiff base N,N 0 -bis-(trans-2-nitrocinnamaldehyde)ethylenediamine (Nca 2 en), (1), and its Cu I complex, (2), containing also triphenylphosphane and isothiocyanate as ligands (see Scheme 1), and compare this complex with others containing the same ligand and its analogue without nitro groups. Although the structures of 11 complexes of (1) as a ligand with cobalt, nickel, copper, zinc and silver have been reported (Kirchner et al, 1987;Dehghanpour, Mahmoudi, Sepaveh & Ng, 2006;Dehghanpour & Mahmoudi, 2007;Habibi, Montazerozohori et al, 2007;Dehghanpour, Mahmoudi & Haghighatseresht, 2006;Dehghanpour, Kempe et al, 2006;Habibi, Lalegani et al, 2007a,b,c;Dehghanpour et al, 2008), the crystal structure of (1) itself has been obtained now for the first time (with the aid of synchrotron radiation because of the very small crystal size and twinning). The analogous Schiff base without nitro groups, N,N 0 -bis(trans-cinnamaldehyde)ethylenediamine, (3), has previously been crystallographically characterized (Khalaji & Weil, 2007), as have 18 of its complexes with cobalt, nickel, copper, zinc and silver (Meghdadi et al, 2002;Kickelbick et al, 2002Kickelbick et al, , 2003Khalaji, Aoki & Amirnasr, 2007;Amirnasr et al, 2003Amirnasr et al, , 2006Khalaji et al, 2006;Khalaji, Amirnasr & Schenk, 2007;Cai et al, 2008).…”

3-Hydroxy-N′-(2-hydroxybenzylidene)benzohydrazide

“…For related literature, see: Ali et al (2005); Eltayeb et al (2008); Habibi et al (2007); Jing et al (2006); Ling et al (2008); Peng & You (2007); Peng & Zhou (2007); Peng, Ping & Song (2007); ; ; Yehye et al (2008a,b).…”

“…Schiff bases derived from the condensation of aldehydes with primary amines play an important role in coordination chemistry (Ali et al, 2005;Eltayeb et al, 2008;Habibi et al, 2007). Recently, we have reported synthesis and crystal structure of some Schiff base complexes Peng & You, 2007;Peng & Zhou, 2007).…”