Ant type specimens (Hymenoptera, Formicidae) in the collection of Volodymyr Opanasovych Karawajew. Communication 1. Dorylinae, Poneromorpha and Pseudomyrmecinae.

The collection of Volodymyr Opanasovych Karawajew, stored at the Schmalhausen Institute of Zoology of the National Academy of Sciences of Ukraine (SIZK, Kiev), is one of the richest ant collections of the world. It contains more than 20,000 dry mounted specimens, collected mostly in Southeast Asia and the Palaearctic, as well as in the Afrotropics, Australia, and North and South America. Among them, we found type specimens of 509 taxa, described by Karawajew and other myrmecologists.

(EtN)[W(DAPBH)(CN)], the first pentagonal-bipyramidal W(III) complex with unquenched orbital angular momentum: a novel Ising-type magnetic building block for single-molecule magnets.

The first pentagonal-bipyramidal tungsten(III) complex (EtN)[W(DAPBH)(CN)] with a NO-type Schiff-base ligand and two apical cyanide groups was synthesized and characterized structurally and magnetically. The complex has a low-spin ( = 1/2) ground state and features unquenched orbital angular momentum = ±1 causing very strong Ising-type magnetic anisotropy.

Pentagonal-bipyramidal 4d and 5d complexes with unquenched orbital angular momentum as a unique platform for advanced single-molecule magnets: current state and perspectives.

This article overviews the current state and prospects of the concept of advanced single-molecule magnets (SMMs) based on low-spin ( = 1/2) pentagonal-bipyramidal (PBP) 4d and 5d complexes with unquenched orbital angular momentum. This approach is based on the unique property of PBP 4d and 5d complexes to cause highly anisotropic spin coupling of perfect uniaxial symmetry, -zizj - (xixj + yiyj), regardless of the local geometric symmetry. The M(4d/5d)-M(3d) exchange-coupled pairs in the apical positions of the PBP complexes produce Ising-type exchange interactions (|| > ||), which serve as a powerful source of uniaxial magnetic anisotropy of a SMM cluster.

A Series of Novel Pentagonal-Bipyramidal Erbium(III) Complexes with Acyclic Chelating Schiff-Base Ligands: Synthesis, Structure, and Magnetism.

A series of six seven-coordinate pentagonal-bipyramidal (PBP) erbium complexes, with acyclic pentadentate [] Schiff-base ligands, 2,6-diacetylpyridine bis-(4-methoxybenzoylhydrazone) [HDAPMBH], or 2,6-diacethylpyridine bis(salicylhydrazone) [HDAPS], and various apical ligands in different charge states were synthesized: [Er(DAPMBH)(CHOH)Cl] (); [Er(DAPMBH)(HO)Cl]·2CHOH (); [Er(DAPMBH)(CHOH)Cl] (); [Er(DAPMBH)(CHOH)(N)] (); [(EtH)N][Er(HDAPS)Cl] (); and [(EtH)N][Y.Er.(HDAPS)Cl] ().

The first pentagonal-bipyramidal vanadium(III) complexes with a Schiff-base NO pentadentate ligand: synthesis, structure and magnetic properties.

A series of three mononuclear pentagonal-bipyramidal V(iii) complexes with the equatorial pentadentate N3O2 ligand (2,6-diacethylpyridinebis(benzoylhydrazone), H2DAPBH) in the different charge states (H2DAPBH0, HDAPBH1-, DAPBH2-) and various apical ligands (Cl-, CH3OH, SCN-) were synthesized and characterized structurally and magnetically: [V(H2DAPBH)Cl2]Cl·C2H5OH (1), [V(HDAPBH)(NCS)2]·0.5CH3CN·0.5CH3OH (2) and [V(DAPBH)(CH3OH)2]Cl·CH3OH (3).

(EtN)[Mo(DAPBH)Cl], the first pentagonal-bipyramidal Mo(iii) complex with a NO-type Schiff-base ligand: manifestation of unquenched orbital momentum and Ising-type magnetic anisotropy.

The first paramagnetic pentagonal-bipyramidal complex of Mo(iii) with a N3O2-type Schiff-base ligand was synthesized by the comproportionation reaction between Mo(ii) and Mo(iv) congeners. The complex has a low-spin (S = 1/2) ground state of MoIII(4d3) with double orbital degeneracy and unquenched orbital momentum, which result in strong Ising-type magnetic anisotropy.

A new Mo(iv) complex with the pentadentate (NO) Schiff-base ligand: the first non-cyanide pentagonal-bipyramidal paramagnetic 4d complex.

A heptacoordinate complex [Mo(DAPBH)Cl] (HDAPBH is 1,1'-(pyridine-2,6-diyl)bis(ethan-1-yl-1-ylidene)dibenzohydrazine) has been synthesized and characterized structurally and magnetically. It exhibits a slightly distorted pentagonal bipyramidal geometry and reveals paramagnetic behaviour resulting from two unpaired electrons (S = 1) with large positive zero-field splitting (D = +50 cm) and pronounced temperature-independent paramagnetism.

Tri-, tetra-, and hexanuclear mixed-valence molybdenum clusters: structural diversity and catalysis of acetylene hydrogenation.

A series of novel cluster compounds comprising molybdenum in a low valence state was synthesized by means of a disproportionation of the dimeric compound [MoCl(OCH)(CHOH)] (1). The reaction of 1 with CHOH leads to the disproportionation of Mo yielding an unusual mixed-valence cluster [MoClO(OCH)(CHOH)] (2). By exploring this synthetic approach further, tri-{[MoCl(OCH)(CHOH)] (3)}, tetra-{[MoCl(OCH)(CHOH)] (4), [MoClO(OCH)(CHOH)] (5), [MoCl(OCH)(CHOH)] (6)}, and hexanuclear {[MoClO(OCH)(CHOH)] (7)} molybdenum alkoxides were synthesized by the reaction of 1 with methanol and stoichiometric amounts of magnesium methoxide, thus providing a general facile access to the polynuclear methoxide complexes of a low-valence molybdenum.

Retrosynthetic approach to the design of molybdenum-magnesium oxoalkoxides.

The reaction of MoCl5 methanolysis in the presence of magnesium ions was shown to produce an extensive row of heterobimetallic Mg-Mo(V, VI) oxomethoxides of different nuclearity ranging from 4 for [Mg2(CH3OH)4Mo2O2(OCH3)10] (1) to 26 for [Mg(DMF)3(CH3OH)3]2[Mo22Mg4O48(OCH3)28(DMF)6] (2) with the latter possessing a ring morphology. Examination of [Mo6O12(OCH3)16Mg4(CH3OH)6] (3), [Mo6O12(OCH3)12Mg2(DMF)4] (4a), and [Mo6O16(OCH3)4Mg2(DMF)8] (5a) X-ray structures revealed the presence of the well known tetranuclear core {Mo4O8(OCH3)2}(2+) thus similar reactivity patterns leading to their formation were assumed. For convenient synthesis of such heterobimetallic oxoalkoxides, the retrosynthetic approach based on speculative deconstruction of a target molecule onto simpler fragments was suggested and successfully employed.

[The effect of cerebrocrast on the microcirculation in acute transient cerebral ischemia].

In experiments on rats with cerebral ischemia (30-min occlusion of carotid arteries), the novel calcium antagonist Cerebrocrast (0.4 microgram.kg-1.

[Cerebokrast as a corrector of postischemic phenomena in acute transient cerebral ischemia].

Acute cerebral ischemia in cats (both carotid arteries occlusion during 30 min after permanent occlusion of both vertebral arteries) was accompanied by postischemic hypoperfusion and hypo-oxygenation of the cerebral tissue. Intravenous infusion of cerebrocrast (1 micrograms.kg-1.

[The evaluation of the efficacy of antihypoxic agents lowering hemoglobin oxygen affinity in acute cerebral ischemia].

Influence of natrii hydroxybutyrate (100 mg/kg), ascorbate (100 mg/kg), cavinton (5 mg/kg), bemitil (50 mg/kg), ethomersol (50 mg/kg) on Hb-O2 affinity and cortex PO2 after both carotid artery occlusion in rats was investigated. Correlation (r-0.87; P less than 0.

[Isolation and properties of chymotrypsin and trypsin labeled with iodine radioisotopes].

Comparative study of iodination of chymotrypsin and trypsin was carried out using either iodine monochloride or the electrochemical procedure under conditions of controlled anode potential. It was shown that a part of iodine monochloride was consumed for oxidation of protein molecules. As a result of this process specific activity of the enzymes was decreased down to 50-60% of the initial activity after introduction of 2 atoms of iodine per a molecule.

[Mechanisms of the inhibitory effect of clonidine on the reproductive system of female rats].

It has been demonstrated in experiments on puberal and infantile female rats that a single subcutaneous injection of clonidine (0.03 mg/kg) disturbed whereas in a dose of 1 mg/kg completely inhibited spontaneous or induced ovulation as well as sexual receptivity. When injected in a daily dose of 0.

[Role of hemodynamic factors and heart volume in the prognosis of acute cardiac insufficiency during the early postoperative period in patients with mitral valve stenosis].

Investigations performed in 172 patients have shown that the state of the myocardium (such parameters as the heart volume, degree of lung hypertension, end-diastolic pressure in the right and left ventricles) is of great importance in pathogenesis of the development of acute heart failure in the early postoperative period in patients with mitral stenosis of the IIIrd and IVth stage of the blood circulation insufficiency.