We present the results of the optical identification and spectroscopic redshift measurements of 216 galaxy clusters detected in the SRG/eROSITA all-sky X-ray survey. The spectroscopic observations ...were performed in 2020–2023 with the 6-m BTA telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences, the 2.5-m telescope at the Caucasus Mountain Observatory of the Sternberg Astronomical Institute of the Moscow State University, the 1.6-m AZT-33IK telescope at the Sayan Solar Observatory of the Institute of Solar–Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences, and the 1.5-m Russian–Turkish telescope (RTT-150) at the TÜBİTAK Observatory. For all of the galaxy clusters presented here the spectroscopic redshift measurements have been obtained for the first time. Of these, 139 galaxy clusters have been detected for the first time in the SRG/eROSITA survey and 22 galaxy clusters are at redshifts
, including three at
. Deep direct images with the
rizJK
filters have also been obtained for four distant galaxy clusters at
. For these observations we chose the most massive clusters and, therefore, most of the galaxy clusters presented here with the spectroscopic redshifts measured by us will most likely enter in future into the cosmological samples of galaxy clusters from the SRG/eROSITA survey.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
New data on geology and 21 K-Ar dates of the Late Oligocene-Quaternary basalts in Syria, combined with analysis of the new and previous data are used to reconstruct the volcanic history and relations ...between it and tectonic events. Volcanism began at the end of Oligocene (26-24 Ma) and was concentrated in the Late Oligocene-Early Miocene along a N-trending band, which stretches from the Jebel Arab (Harrat Ash Shaam) up to Kurd Dagh and southern Turkey. Activity waned in the Middle Miocene (17-12 Ma), but was resumed in the same band in the Tortonian and increased in the Messinian and Early Pliocene (6.3-4 Ma), when volcanism spread to the Shin Plateau and its coastal extension. After a brief hiatus 4-3.5 Ma, volcanism became still more intensive and spread from the N-trending band to the east into the northern margin of the Mesopotamian Foredeep and to the west into the Dead Sea Transform zone. Additional eruptions continued into the Holocene. Volcanism lasted > 25 million years in the Jebel Arab Highland and > 15 million years in the Aleppo Plateau. The long duration of volcanism in the same parts of the moving Arabian plate and absence of records of one-way migration of the activity mean that the magmatic sources moved together with the plate, i.e., they were situated within the lithosphere mantle. Coincidence of the tectonic and volcanic stages of the Arabian plate development proves that volcanic activity depended on the geodynamic situation, caused by the plate motion. Situated within the lithosphere, magmatic sources within this transverse band were possibly caused by thermal and deforming influences of the asthenospheric lateral flow, moved laterally from the Ethiopia-Afar deep superplume.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
We present the results of our search for massive galaxy clusters among extended X-ray sources from the SRG/eROSITA survey using data from the Planck survey and data from optical and infrared sky ...surveys. Optical observations of these clusters are carried out with the 6-m telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences (BTA), the 2.5-m telescope at the Caucasus Mountain Observatory of the Sternberg Astronomical Institute of the Moscow State University (AZT-33IK), and the 1.5-m Russian–Turkish telescope (RTT-150). We provide data on the optical identifications and spectroscopic redshift measurements for 11 massive galaxy clusters with masses higher than
located at redshifts
–
. Such clusters are very rare objects; most of the clusters with such a high mass in the observable Universe have already been detected previously by the Sunyaev–Zeldovich effect in the Planck all-sky survey. Being anomalous, they can be sensitive indicators of possible deviations of the cosmology from the standard
model with a quasi-flat spectrum of initial Gaussian perturbations.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The reaction of 1,2-bis(2,6-diisopropylphenyl)iminoacenaphthene (dpp-bian
(1)
) with one equivalent of SnCl
2
gave the complex (dpp-bian)
0
SnCl
2
(2)
containing the neutral dpp-bian ligand. ...Paramagnetic stannylene (dpp-bian)
−
SnCl
(3)
was prepared by the treatment of dpp-bian with a fivefold excess of SnCl
2
and KC
8
. The treatment of dpp-bian with one equivalent of SnCl
2
and two equivalents of KC
8
in the presence of one equivalent of CpFe(CO)
2
2
afforded the diamagnetic stannylene complex (dpp-bian)
2−
Sn
(4)
based on the dpp-bian dianion. The diazastannacycle in complex
4
was proved to be aromatic by NMR spectroscopy. The new compounds were characterized by elemental analysis, IR spectroscopy
(2–4)
, multinuclear NMR spectroscopy
(2, 4)
, and EPR spectroscopy
(3)
. The molecular structures of complexes
2–4
were determined by single-crystal X-ray diffraction.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Nanostructured zirconium carbide coatings were deposited on the surface of multi-walled carbon nanotubes (MWCNT) by the metal-organic chemical vapor deposition growth technique using ...bis(cyclopentadienyl)zirconium dichloride as precursor. The effect of synthesis parameters on the morphology of samples ZrC/MWCNT was studied and the optimal synthesis conditions were selected. The structure and morphology of synthesized hybrid nanomaterials were investigated by X-ray diffraction, scanning and transmission electron microscopy.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The reaction of (Dpp-Bian)Mg(THF)
3
(
I
) (Dpp-Bian is 1,2-bis(2,6-diisopropylphenyl)iminoacenaphthene) with tosyl azide (TosN
3
) affords the binuclear amide complex ...(Dpp-Bian)Mg(THF)(NTos)(THF)Mg(Dpp-Bian) (
II
) in which the magnesium atoms are linked with the nitrogen atom by the bridging
p
-tolylsulfamide group. In the presence of pyridine, the reaction leads to the compound (Dpp-Bian)Mg(Py)(NTos)(Py)Mg(Dpp-Bian) (
III
) in which NTos has different coordination modes with the metal atoms. The diimine ligand is in the radical anion state in both compounds. New paramagnetic compounds
II
and
III
are characterized by IR spectroscopy, EPR spectroscopy, elemental analysis, and X-ray diffraction analysis (СFА files CCDC no. 1878433 (
II
· 1.5C
5
H
12
) and 1878432 (
III
· 2C
7
H
8
· 0.5OC
4
H
8
)).
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The reaction of the hydride (dpp-bian)Al(H)Cl (
1
) containing the 1,2-bis(2,6-diisopropylphenyl) iminoacenaphthene (dpp-bian) radical anion with MeLi affords the compound (dpp-bian)Al(H)Me (
2
). ...The reaction of complex
1
with two equivalents of PhC≡CNa involves the replacement of chlorine along with oxidative substitution of hydrogen accompanied by the reduction of dpp-bian to the dianion to form the compound (dpp-bian)Al(C≡CPh)
2
Na(Et
2
O)
2
({sn3}). This reaction gives the complex {dpp-bian(H)}Al(C≡CPh)
3
Na(Et
2
O)
2
(
4
) as the second product, which is apparently generated in the reaction of compound
3
with PhC≡CH. The reaction of compound 1 with Cp*Na (Cp* is pentamethylcyclopentadiene) in dimethoxyethane is also accompanied by the reduction of redox-active dpp-bian to the dianion, giving the complex (dpp-bian)Al(H)ClNa(DME)
3
(
5
). Diamagnetic derivatives
3–5
were characterized by
1
H NMR spectroscopy; paramagnetic compound
2
, by EPR spectroscopy. The molecular structures of compounds
2–5
were determined by X-ray diffraction.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
We discuss the results of our spectroscopy for 17 candidates for distant quasars selected by the SRGz classification system based on data from the first and second sky surveys with the eROSITA ...telescope onboard the SRG X-ray observatory. Most of the quasar candidates were selected within the DaLeQo observing program, whose goal is a search for the most X-ray luminous quasars with luminosities
erg s
at redshifts
. Our spectroscopic observations were carried out at the 6-m BTA telescope with the SCORPIO-2 spectrograph. We have managed to confirm eight new X-ray quasars at
, including the quasar SRGe J020142.8-015347 at
. Owing to the large diameter of the BTA mirror and the high quantum efficiency of the SCORPIO-2 spectrograph in the range 6000–9000 Å, we have managed to measure the С IV (1549 Å) line parameters and to estimate the supermassive black hole masses and accretion rates for seven quasars.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A reaction of digallane (dpp-bian)Ga—Ga(dpp-bian) (
1
) (dpp-bian is the 1,2-bis(2,6-disopropylphenyl)iminoacenaphthene) with one equivalent of I
2
leads to oxidation of (dpp-bian)
2–
in compound
1
...to (dpp-bian)–and gives (dpp-bian)GaI—GaI(dpp-bian) (
2
). In the reaction of compound
2
with two equivalents of (acac)Na, not only exchange of the iodide and acetylacetonate ions takes place, but also a transfer of electrons from the metal—metal bond to dpp-bian with the formation of the complex (dpp-bian)Ga(acac) (
3
), in which the dpp-bian ligand is a dianion. A reaction of digallane
1
with 2,2´-bipyridyl at 200 °C in toluene in a sealed tube leads to the reduction of 2,2´-bipyridyl and gives the complex (dpp-bian)Ga(bipy) (
4
), which contains two different chelate redox-active ligands. The new compounds were characterized by IR (
3
,
4
), NMR (
3
), and ESR spectra (
4
), the structures of both derivatives were established by X-ray diffraction.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The reaction of Dpp-Bian (Dpp-Bian is 1,2-bis(2,6-diisopropylphenyl)iminoacenaphthene) with one equivalent of iodine and an excess of metallic tin affords paramagnetic complex (Dpp-Bian)
1–
SnI (
I
...). The reaction of this complex with one equivalent of
n
-butyllithium or lithium
tert
-butylate affords (Dpp-Bian)
1–
SnBu (
II
) or (Dpp-Bian)
1–
SnO
t
Bu (
III
), respectively, that rapidly decompose to form stannylene (Dpp-Bian)
2–
Sn (
IV
). Stannylene
IV
exhibits reduction properties toward Dpp-Mian (Dpp-Mian is 2‑mono(2,6-diisopropylphenyl)iminoacenaphthen-1-one) with the formation of tin(IV) complex {bis(Dpp-Mian)}
2
Sn (
V
). The reduction of the diimine ligand with more acceptor substituents CF
3
-Bian (CF
3
-Bian is 1,2-bis(3,5-trifluoromethylphenyl)iminoacenaphthene), unlike Dpp-Bian, can occur directly with metallic tin resulting in
(CF
3
-Bian)
2–
Sn (
VII
). New compounds are characterized by IR, NMR, and EPR spectroscopy and elemental analysis. The molecular structures of complexes
I
and
VII
are determined by X-ray diffraction (CIF files CCDC nos. 2130839 (
I
) and 2130840 (
VII
)).
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
