A new polyether macrocyclic of 1-pyrazolylbenzimidazol-2-ones 5-6 have been synthesized by the reaction of dichloro(poly)ethylene glycol in phase transfer catalysis conditions. The structure of these compounds were identified by H NMR, C NMR, IR spectroscopy and Mass spectrometry. The formation of Li, Na, and K complexes with compounds 5-6 has been investigated by UV-visible spectroscopy. It wa...

Chiral tetraaza macrocyclic nickel(II) and palladium(II) complexes 2a-e, containing one or two (R,R)-(-)-1,2-cyclohexanediyl bridges, were synthesized by template condensation reactions and characterized by (1)H and (13)C NMR, IR, UV-vis, and mass spectrometry. The electrophilic reactivity of 2a was explored. Crystal structures of Ni complex 2b and metal-free ligand 5 were determined by single-...

In the centrosymmetric title complex, [Ni(C(16)H(36)N(4))](C(14)H(14)O(3)PS)(2), the Ni(II) ion is coordinated by four N atoms and two O atoms within a slightly distorted NiN(4)O(2) octa-hedral geometry. The asymmetric unit consits of one Ni(II) ion that is located on a center of inversion, half of the macrocylic ligand and one anion occupying general positions. Intra-molecular N-H⋯O and N-H⋯S ...

Reaction of tetraphosphine platinum(II) complexes with 2-azidoethyl isocyanide 3 in methanol leads to complexes with two trans-coordinated NH,NH-stabilized carbene ligands 6(X)(2). Complexes 6(X)(2) react with phenyldivinylphosphine under substitution of the remaining phosphine ligands followed by an intramolecular hydroamination reaction to produce complex 1(PF(6))(2) with a macrocyclic [16]an...

In the title centrosymmetric dinuclear zinc(II) complex, [Zn(2)(C(36)H(42)N(4)O(2))(NO(3))(2)], the Zn(II) atom has a distorted octa-hedral geometry, defined by two N atoms and two O atoms from the macrocyclic ligand and two O atoms from a chelating nitrate anion and are bridged by two phenolate O atoms, forming a four-membered Zn(2)O(2) ring.

Using recognition moieties that bind to the inner co-ordination sphere of a monomeric DO3A-type di-aqua complex, dimeric poly(aminocarboxylate) gadolinium(III) compounds can be formed with greatly enhanced relaxivities, arising from optimized contributions of inner- and second spheres of hydration.

Nitric oxide binds reversibly to the Fe(III) complex of a well-developed tetra-amido macrocyclic ligand. Reaction with NO results in formation of a species consistent with an S = 1 {Fe-NO}(6) ground state as characterized by UV-vis, IR, EPR, and Mössbauer spectroscopy. The resultant nitrosyl is labile and dissociates readily upon purging with N(2), thus providing a rare example of reversible NO...

In the title centrosymmetric dinuclear nickel complex, [Ni(2)(C(22)H(30)N(4)O(2))(NO(3))(2)], each of the two Ni(II) atoms has a distorted octa-hedral geometry, defined by two N atoms and two O atoms from the macrocyclic ligand and two O atoms from a chelating nitrate anion. The two Ni atoms are bridged by two phenolate O atoms, forming a four-membered Ni(2)O(2) ring.