A series of 18-membered macrocyclic complexes of metal Ni(II) of the type [M(H2Cy )] have been synthesized and characterized on the basis of spectral, magnetic and conductivity studies. The macrocyclic ligands H 4 Cy1-4 (Fig. 1) are tetrabasic having four imido hydrogen but behave in a dibasic manner. Out of eight nitrogens, four imido and four imino, ligands utilize four imido nitrogens for sq...

The ability of macroheterocyclic compounds to complex with ionic species has led to the synthesis and investigation of many multidentate macroheterocyclic species . The most stable complexes are formed between macrocyclic polyetheral ligands (crown ethers) with alkali or alkaline earth metal iona. There is an excellent correlation of the stability of these complexes with the size of the cation ...

The increase of the ionic strength amplifies the species bearing acidic side chains from a bio-inspired dynamic combinatorial library of macrocyclic pseudopeptides, in close resemblance to the evolution observed for the proteins of halophilic microorganisms.

A practical and modular approach to obtain a diverse set of 14-membered macrocyclic compounds from carbohydrates is developed that utilizes functional groups at C-1 and C-5. The evaluation of this toolbox in various zebrafish assays led to the identification of 2.7f as an antiangiogenesis agent.

The title compound, C(12)H(16)N(12), is a centrosymmetric mol-ecule which comprises of a hexa-aza[14]annulene macrocyclic ring fused with two pyrazole rings. The macrocyclic ring is essentially planar, with an r.m.s. deviation of 0.0381 Å. The electron pairs of the amino groups are delocalized with the conjugated system of the macrocycle. Strong intra-molecular N-H⋯N hydrogen bonds arranged in ...

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-...