Crystal Structure of N,N'-Bis(trans-cinnamaldehyde)ethylenediimine

Abstract

Bidentate Schiff bases are important ligands in the development of transition-metal complexes, such as copper(I) 1-3 and silver(I) complexes.

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

“…There are no significant differences between this structure and that of the analogue without nitro groups, i.e. (3), except that the latter has almost coplanar ring and chain segments within each half of the molecule (Khalaji & Weil, 2007); both have crystallographic inversion symmetry and essentially the same conformation for the conjugated chains and central ethylenediamine unit. (3) 95Symmetry codes: (ii) Àx þ 3 2 ; y À 1 2 ; Àz þ 3 2 ; (iii) Àx þ 1; Ày þ 2; Àz þ 1; (iv) Àx þ 1 2 ; y þ 1 2 ; Àz þ 3 2 .…”

“…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). The structures of no other ring-substituted derivatives of this ligand, or complexes of them, have been reported.…”

Silver(I) and zinc(II) complexes with symmetrical cinnamaldehyde Schiff base derivative: Spectroscopic, powder diffraction characterization, and antimycobacterial studies

“…The structure solution process for both cases was performed by the simulated annealing technique [15] also implemented in TOPAS. In addition, the EnCinn rigid body model based on single-crystal data [16] was built using Z-matrix formalism, with free rotations and translations as well torsion angles as described in Chart 1. It is worth note that there is no free rotation for N1@C2 and C3@C4 axes due the double bonds between these atoms.…”