Metal ion complexes of .alpha.-amido acids. 1. Structure and magnetic properties of the nickel and cobalt hippurates. Pseudo-one-dimensional magnetic systems

1D CoII and NiII Chiral Polymers That Exhibit Ferromagnetic Interactions

“…This model has been predominantly used for isotropic S = 5/2 systems (see, for example, the literature [46,47] ) but also to characterize Ni II chains with antiferromagnetic [48][49][50] or ferromagnetic [51] exchange interactions. The magnetic behaviors of I L (Ni) and I D (Ni) compounds have been fitted using this model and by taking into account an intermolecular interaction term (zJЈ) and an impurities contribution (ρ).…”

Ternary complexes metal [Co(II), Ni(II), Cu(II) and Zn(II)] – ortho-iodohippurate (I-hip) – acyclovir. X-ray characterization of isostructural [(Co, Ni or Zn)(I-hip)2(ACV)(H2O)3] with stacking as a recognition factor

“…1 H NMR spectra were recorded on a Brucker AMX 300 spectrophotometer at room temperature. Proton chemical shifts in deuterated dimethylsulfoxide (DMSO-d 6 ) were referenced to DMSO-d 6 [d(DMSO): 2.60 ppm]. Thermogravimetric data in the temperature range from 30 to 800°C were recorded in a flowing oxygen atmosphere (heating rate 2°C/min) on a TA Instruments SDT 2960 Simultaneous DSC-TGA thermobalance.…”

“…We have only been able to study one binary complex [Zn(I-hip) 2 (H 2 O) 2 ] 2 AE 3H 2 O (8) which shows a noncoplanarity between the peptide bond and the aryl ring [dihedral angle C(11)-C(6)-C(5)-O(5), 97.3°] contrarily to the coplanar disposition present in normal hippurate derivatives [6][7][8][9][10][11][12][13][14][15][16][17]. This different behavior must be related to the steric effect of ortho-iodine moiety.…”

“…Although several binary [6][7][8][9][10][11][12][13] and ternary [12,[14][15][16][17] complexes with hippuric acid and other related derivatives have been described in the literature, we have not found any structural information about transition metal complexes of I-hipH. For this reason we have studied the binary derivatives of o-iodohippuric acid with different divalent 3d transition metal ions: Zn(II), Cu(II), Co(II) and Ni(II) and their possible interaction with acyclovir (ACV) (Scheme 1) in order to know the general characteristics of this type of complexes.…”

Synthesis, characterization and biological activity studies of octahedral nickel(II) complexes

“…1). Selected bond lengths and angles within the complexes are listed in Table 2 coordination polyhedron compare well with those found in other octahedral complexes of nickel(II) involving N donor atoms [18]. Complex 2 crystallized in the monoclinic space group P2 1 /c with two molecules in the unit cell.…”