Vardan A. Hayrapetyan

A.B. Nalbandyan Institute of Chemical Physics · Innovation Center for Nanoscience and Technology

Reaction of small increments of NO2 gas with sublimed amorphous layers of MnII(TPP) (TPP = meso-tetra-phenylporphyrinato dianion) in a cryostat leads to formation of the 5-coordinate nitrato complex MnIII(TPP)(η1-ONO2) (II) through the two distinct steps with initial formation of the nitrito complex MnIII(TPP)(η1-ONO) (I). Low-temperature interacti...

Reaction of NO with amorphous Mn(TPP) layers gives two Mn(TPP)(NO) isomers with linear and bent Mn-N-O geometries that reversibly interconvert with changes in temperature. DFT computations predict that the linear complex is the singlet ground state while the bent structure is a triplet state.

The oxy-cobolglobin models of the general formula (NH(3))Co(Por)(O(2)) (Por = meso-tetra-phenyl and meso-tetra-p-tolylporphyrinato dianions) were constructed by sequential low temperature interaction of NH(3) and dioxygen with microporous layers of Co-porphyrins. At cryogenic temperatures small increments of NO were introduced into the cryostat and...

Lake Sevan is a meso-eutrophic water body, which was severely impacted by anthropogenic level decrease, pollution and eutrophication during the last century. Starting in the 1970s, these processes resulted in the formation of an oxygen-depleted hypolimnion during summer–autumn stratification of the lake. In this work, we demonstrate for the first t...

We describe here nitric oxide dioxygenation (NOD) by the dioxygen manganese porphyrin adducts Mn(Por)- (η2-O2) (Por2− = the meso-tetra-phenyl or meso-tetra-p-tolylporphyrinato dianions, TPP2− and TTP2−). The Mn(Por)(η2-O2) was assembled by adding O2 to sublimed layers of MnII(Por). When NO was introduced and the temperature was slowly raised from 8...