Synthesis, Crystal Structure, and Spectroscopic Properties of Cu(II) Complex with 14-Membered Hexaazamacrocyclic Ligands

Abstract

CuL(ClO 4 ) 2 ] complex of 14-membered hexaazamacrocyclic ligand (L = 6,13-dimethyl-3,10-dioctyl-1,3,5,8,10,12-hexaazacyclotetradecane) was synthesized by template condensation reaction of 1,2-diaminopropane, octylamine, and formaldehyde in ethanol. The product was characterized by elemental analysis, Fourier-transformed infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), diffused reflectance spectroscopy (DRS), liquid chromatography-mass spectrometry (LC-MS), and X-ray crystallographic technique. Thermal behavior of this complex was studied by thermogravimetric analysis (TGA). The IR and other spectral properties were consistent with the result from X-ray diffraction. The electronic absorption spectra of [CuL(ClO 4 ) 2 ] complex showed one band at 500 nm corresponding to 2 B 1g ? 2 B 2g transition. The complex crystallized in the triclinic space group of Pī with a = 8.1307(6) Å , b = 9.3579(7) Å , c = 13.3930(10) Å , a = 95.932(2)°, b = 98.579(2)°, and c = 114.478(2)°. The copper(II) ion of the macrocyclic cation displayed a tetragonally distorted octahedral geometry with four nitrogen atoms in the equatorial plane and two oxygen atoms from the perchlorate ions weakly coordinated to the copper(II) ion in the axial positions. The complex exhibited only weak luminescent property.Graphical Abstract A new macrocyclic complex that can be easily obtained from the one-pot synthesis.

Copper(II) complex as a precursor for formation of cyano-bridged pentanuclear FeIII-CuII bimetallic assembly: Synthesis, characterization, crystal structure and antibacterial activity

“…The splitting of ν(Cl-O) band clearly indicated the presence of coordinated perchlorate. 21 In complex 2, the FT-IR spectrum ( Figure S2, in Supplementary Information) showed strong band at 3247 cm −1 which was assigned to secondary amine group. The vibrations from cyanide ligand may vary depending on the bonding mode, 22 24 the two absorption bands observed at 2117 and 2097 cm −1 were assigned to the terminal cyanide and the bridging cyanide ions, respectively.…”

“…Similar type of ESI mass spectral pattern was also observed in the hexaazamacrocyclic copper(II) complex reported previously. 21 Based on the physico-chemical and the spectral studies, the structure proposed for 1 is shown in Figure 1.…”

Crystal structure and photoluminescence properties of a new monomeric copper(II) complex: bis(3-{[(3-hydroxypropyl)imino]methyl}-4-nitrophenolato-κ3 O,N,O′)copper(II)

“…Transition-metal compounds have been of great interest and importance for researchers since they play a critical role in the development of coordination chemistry in structures such as one-dimensional chains, two-dimensional layers, three-dimensional frameworks and especially metal-organic frameworks (MOFs) (Paul et al, 2016;Pal et al, 2016;Kongchoo et al, 2016). They have great potential applications, for example, as luminescent probes, in catalysis (Gungor et al, 2014), as sensors (Zheng et al, 2016), in nonlinear optics (Karakas et al, 2006), as single-molecule magnets (SMMs) (Kahn, 1993;Caneschi et al, 2015;Blacque et al, 2016) and for exhibiting biological activities (Jamaludin et al, 2016), and also in solar-cell and photovoltaic technologies (Freitag et al, 2016;Magni et al, 2016).…”