Mononuclear metal-dioxygen adducts, such as metal-superoxo and -peroxo species, are generated as key intermediates in the catalytic cycles of dioxygen activation by heme and non-heme metalloenzymes. We have shown recently that the geometric and electronic structure of the Ni-O2 core in [Ni(n-TMC)(O2)]+ (n = 12 and 14) varies depending on the ring size of the supporting TMC ligand. In this study...

In the title compound, [Ni(C(12)H(8)N(5))(2)(H(2)O)(4)]·2H(2)O, the Ni(II) atom is coordinated by the two N atoms [Ni-N = 2.094 (3) Å] and four O atoms [Ni-O = 2.063 (3)-2.083 (2) Å] in a distorted octa-hedral geometry. The mol-ecule is centrosymmetric and the Ni(II) atom is located on an inversion center. Inter-molecular O-H⋯N and O-H⋯O hydrogen bonds link the complex into a three-dimensional ...

M(2)L(4) molecular capsules self-assembled from M(II) ions (where M = Zn, Ni, and Pd) and bent bidentate ligands constructed from anthracene fluorophores. The Ni(II) and Zn(II) capsules exhibited weak to strong blue emission unlike traditional Pd(II) cages and capsules.

In this work, we designed and synthesized a heterobimetallic ruthenium(ii)-nickel(ii) complex, [Ru(bpy)2(phen-DPA)Ni](PF6)4 (Ru-Ni), as a highly selective phosphorescence probe for histidine. The probe exhibited weak emission at 603 nm because the phosphorescence of the Ru(ii) complex can be strongly quenched by the paramagnetic Ni(2+) ion. In the presence of histidine, reaction of Ru-Ni with h...

In this study, aggregation behavior of a water soluble cationic metalloporphyrin, meso-tetrakis (2,3,5,6-tetrafluoro-N,N ,́N ́ ́-trimethyl ammonium phenyl) porphyrin nickel(II) [Ni(II)(TF4TMAPP)] is investigated in 5 mM aqueous phosphate buffer of pH 7.0 at 25.0 °C and various ionic strengths using optical absorption and resonance light scattering spectroscopic methods. The results suggest that [N...

The title compound, [Ni(C(4)H(13)N(3))(2)][Ni(C(4)N(2)S(2))(2)], has been synthesized by the reaction of Ni(ClO(4))(2)·6H(2)O, diethyl-enetriamine (deta) and Na(2)[Ni(mnt)(2)] [mnt = maleonitrile-dithiol-ate(2-)] in methanol. The structure is composed of a [Ni(deta)(2)](2+) cation and a [Ni(mnt)(2)](2-) anion. The coordination geometry of the Ni(II) ion in the cation is slightly distorted octa-...

Nickel is one of the essential trace elements found in biological systems. It is mostly found in nickel-based enzymes as an essential cofactor. It forms coordination complexes with amino acids within enzymes. Nickel is also present in nucleic acids, though its function in DNA or RNA is still not clearly understood. In this study, complex formation tendencies of Ni(II) with adenine and certain L...

The partial oxidation of [Ni(II/II)(2)(RCS(2))(4)] (R = Et (1), n-Pr (2), and n-Bu (3)) with iodine affords the MMX chain compounds [Ni(II/III)(2)(RCS(2))(4)I](infinity) (R = Et (4), n-Pr (5), and n-Bu (6)), respectively. The crystal structures of 4-6 consist of neutral one-dimensional (1-D) chains with a repeating -Ni-Ni-I- unit. The room-temperature (RT) structure of 4 indicates a charge-pola...

Deprotonation of functional salicylaldimines with NaH invariably results in cubane or double-cubane Na(I) aggregates which transmetallate with Ni(II) under different stoichiometric conditions to give Ni(II) complexes that are catalytically active towards ethylene oligomerisation.