Steric Effects of Alkyl Substituents at N-Donor Bidentate Amines Direct the Nuclearity, Bonding and Bridging Modes in Isothiocyanato-Copper(II) Coordination Compounds

Abstract

A series of Cu(II)-isothiocyanato coordination compounds derived from sterically hindered N-donor diamines were synthesized and characterized: catena-[Cu(Me 3 en)(µ-NCS)(NCS)] (1)

Structure and magnetic characterization of some bicompartmental [N6O2] divalent metal(ii) complexes using bis(phenolato) ligands bearing two pendant bis(pyridyl) amine arms

“…Taking this into consideration, the high preference of Cu 2+ binds the nitrogen site in the vast majority of mononuclear Cu-thiocyanato complexes, which in most cases show an absorbance band at a frequency lower than 2000 cm −1 , whereas the corresponding S -NCS bonding, and in some cases, bridged μ N,S -NCS, shows a frequency higher than 2000 cm −1 . 31,32 Thus, based on this criterion and the observed ν as (NCS − ) for complex 8 at 2083 cm −1 , one can consider that the thiocyanates undergo N -NCS Cu 2+ bonding. 31,32 The very close IR spectral pattern of the complex cation of [Cu 2 (HL)(OAc)(CH 3 OH)](PF 6 ) 2 ( 7 ) to the corresponding structurally determined acetato complexes 1 and 5 may suggest a similar acetate bonding mode, therefore, we tentatively suggest the structural formula of 7 as [Cu 2 (HL)(μ 1,2 -OAc)(CH 3 OH)](PF 6 ) 2 .…”

Copper(II) Complexes with Tetradentate Piperazine-Based Ligands: DNA Cleavage and Cytotoxicity

“…In general, the observed band is due to d-d transition in five-coordinate Cu(II)-d 9 complexes. The presence of this band, which is associated with or without low-energy shoulder indicates a square pyramidal (SP) geometry, whereas the single d-d band at λ max ≥ 850 nm with a high-energy shoulder is typical for trigonal bipyramidal (TBP) stereochemistry [46][47][48][49]. Thus, on the basis of this criterion, the spectral data of the complexes are consistent with distorted SP, where the absorption maximum band observed in the visible region results from 2 B 1 ← 2 E transition [46].…”

Structure, DFT Calculations, and Magnetic Characterization of Coordination Polymers of Bridged Dicyanamido-Metal(II) Complexes

“…In addition, CPs containing paramagnetic metal ions can serve as molecule-based magnets [37][38][39][40]. The bridged pseudohalide complexes have the capability to transmit the magnetic interaction between the paramagnetic metal centers across the bridged pseudohalides [1][2][3][4][5][6][7][8][10][11][12][13][14][18][19][20][21][22][23][24].…”

“…χ = 2 tanh 4 T ⁄ + 4 T cosh 4 T ⁄ ⁄ (3) For powder samples, the average susceptibility χ = (χ∥ + 2χ⊥)/3 is measured. The experimental χT versus T data in the dc field of 5000 Oe were fitted with the Ising model over the temperature range of 10-300 K ( Figure 5).…”