Copper(II) Complexes of N,N‐Diisopropylpicolinamide – Solvatochromic and Thermochromic Phase Change of a Monomeric Complex to a Ferromagnetically Coupled Dimeric Complex

Abstract

The synthesis and characterization of mononuclear [Cu(L) 2 -(Cl) 2 ] (1), dinuclear [{CuCl(L)} 2 (μ-Cl) 2 ] (2), and another mononuclear complex [Cu(L) 2 (ClO 4 ) 2 ] (3) with a bidentate N,Ndiisopropylpicolinamide ligand (abbreviated L) are described. Complexes 1 and 2 were obtained from the same reaction mixture and show thermo-and solvatochromic behavior. Complex 1 shows irreversible thermochromism by changing into 2 upon heating at 160°C. These two complexes also show solvatochromism in various solvents. The[a]

Synthesis and the characterization of Schiff-base copper complexes: Reactivity with DNA, 4-NPP and BNPP

“…A similar trend has been found in other copper complexes [74]. As a consequence of the weak Cu-Cl (bridging) bonds such packing arrangement in complex 1 is not sustained in solution where the solvent has strong donor atoms [75]. Complex 1 and complex 2 both have identical 8-aminoquinoline rings as part of the tridentate ligand.…”

Synthesis, characterization, density functional theory, thermal, antimicrobial efficacy, and DNA binding/cleavage studies of Cu(II), Cr(III), Fe(III), Ni(II), Co(II), Zn(II), and Pt(IV) complexes with a derivative of 2‐hydroxyphenoxymethylfuran‐5‐carbaldehyde

“…The band in the range of 630-520 cm −1 corresponds to the M-Cl bond. [34] All edifices are likewise shown groups because of facilitated water particles. The groups in the range 747-854 and 614-623 cm −1 showed up in the spectra of these buildings, which might be allotted to δr(H 2 O) and δw(H 2 O), individually.…”

Crystal structure of a chloride-bridged copper(II) dimer: piperazine-1,4-dium bis(di-μ-chlorido-bis[(4-carboxypyridine-2-carboxylato-κ2N,O2)chloridocuprate(II)]

“…There are several copper(II) dimeric compounds in which the copper atoms are bridged by chlorido ligands (Marsh et al, 1983;Puschmann et al, 2001;Li et al, 2006;Lee, et al, 2008;Han et al, 2008;Øien et al, 2013;Choubey et al, 2015;Golchoubian & Nateghi 2016;Liu et al, 2009). A search of the Cambridge Structural Database (Version 5.38, November 2016; Groom et al, 2016), revealed numerous di--chlorido bridged copper(II) compounds constructed with ligands having -N,O-donor atoms (Kapoor et al, 2002(Kapoor et al, , 2004Damous et al, 2013;Lumb et al, 2013;Smolentsev et al, 2014;Qureshi et al, 2016). However, the search did not reveal related complexes derived from pyridine-2,4-dicarboxylic acid and piperazine.…”