scholarly journals Multistep Photochemical Reactions of Polypyridine-Based Ruthenium Nitrosyl Complexes in Dimethylsulfoxide

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2205
Author(s):  
Nataliia Marchenko ◽  
Pascal G. Lacroix ◽  
Valerii Bukhanko ◽  
Marine Tassé ◽  
Carine Duhayon ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Crystal Structures ◽  
Photochemical Reactions ◽  
X Ray ◽  
Nitrosyl Complexes ◽  
Ruthenium Nitrosyl ◽  
Linkage Isomerization ◽  
The Difference

The photorelease of nitric oxide (NO·) has been investigated in dimethylsulfoxide (DMSO) on two compounds of formula [Ru(R-tpy)(bpy)(NO)](PF6)3, in which bpy stands for 2,2′-bipyridine and R-tpy for the 4′-R-2,2′:6′,2″-terpyridine with R = H and MeOPh. It is observed that both complexes are extremely sensitive to traces of water, leading to an equilibrium between [Ru(NO)] and [Ru(NO2)]. The photoproducts of formula [Ru(R-tpy)(bpy)(DMSO)](PF6)2 are further subjected to a photoreaction leading to a reversible linkage isomerization between the stable Ru-DMSO(S) (sulfur linked) and the metastable Ru-DMSO(O) (oxygen linked) species. A set of 4 [Ru(R-tpy)(bpy)(DMSO)]2+ complexes (R = H, MeOPh, BrPh, NO2Ph) is investigated to characterize the ratio and mechanism of the isomerization which is tentatively related to the difference in absorbance between the Ru-DMSO(S) and Ru-DMSO(O) forms. In addition, the X-ray crystal structures of [Ru(tpy)(bpy)(NO)](PF6)3 and [Ru(MeOPh-tpy)(bpy)(DMSO(S))](PF6)2 are presented.

Magnesiumorganische Innerkomplexe, Teil II [1]. Ethyl(dialkylaminoalkyl)- und Ethyl(4-alkoxybutyl)magnesium-Verbindungen / Organomagnesium Inner Complexes, Part II [1]. Ethyl(dialkylaminoalkyl)- and Ethyl(4-alkoxybutyl)magnesium Compounds

1986 ◽  
Vol 41 (5) ◽  
pp. 617-628 ◽  
Author(s):  
Borislav Bogdanović ◽  
Gudrun Koppetsch ◽  
Carl Krüger ◽  
Richard Mynott
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Chelating Ligand ◽  
Magnesium Compounds ◽  
The Difference

Abstract The reaction of bis(dialkylaminoalkyl)-and bis(4-alkoxybutyl)magnesium inner complexes with MgEt2 leads to the formation of ethyl(dialkylaminoalkyl)-and ethyl(4-alkoxybutyl)magnesium compounds. The X-ray crystal structures of ethyl(3-N,N-dimethylam inopropyl)magnesium and ethyl(3-N-cyclohexyl-3-N-methylaminopropyl)magnesium confirm that the com pounds are dimeric with the α-C-atom of the chelating ligand bridging the magnesium atoms.The difference in reactivity of the Mg-Et and Mg-CnH2nX bonds (X = NR′R″, OR) makes itself apparent in the reaction of these complexes with ethylene: up to six ethylene molecules are inserted, whereby in the case of the ethyl(4-alkoxybutyl)magnesium compounds insertion occurs preferentially into the Mg-Et bond whereas in the case o f the ethyl(dialkylaminoalkyl)magnesium compounds both bonds are equally reactive.

Chemistry and crystal structures of tetrabenzoylethylene, its photolysis product and tetraacetylethylene

1978 ◽  
Vol 31 (6) ◽  
pp. 1265 ◽  
Author(s):  
JR Cannon ◽  
VA Patrick ◽  
CL Raston ◽  
AH White
Keyword(s):  
Solid State ◽  
Crystal Structures ◽  
Molecular Conformation ◽  
Crystallographic Analysis ◽  
Stable Form ◽  
Photolysis Product ◽  
Molecular Conformations ◽  
X Ray ◽  
The Difference ◽  
The Stability

X-ray crystallographic analysis has revealed that the light-sensitive form (A) and the light-stable form (A') of tetrabenzoylethylene are not valence tautomers but are two crystalline modifications of the same substance. The difference in the stability of these forms to light appears to be a consequence of their different molecular conformations and packing in the solid state. The molecular conformation of the A form is represented by (8) and that of the A' form by (9). The related tetraacetylethylene has the conformation (10) in the solid state. X-ray crystallographic analysis has also revealed that the photolysis product (B) of tetrabenzoylethylene is 4-phenoxy-3,4,6-triphenyl-1H,4H-furo[3,4-c]-furan-1-one (11). ��� The crystal structures of (8), (9), (10) and (11) were determined by X-ray diffraction: diffractometer data at 295 K were refined by least-squares techniques to residuals of 0.064 (2161 'observed' reflections) for (8), 0.057 (1310) for (9), 0.049 (1295) for (10) and 0.061 (1639) for (11). Crystals of (8) are monoclinic, P21/n, a 8.775(5), b 17.352(9), c 30.985(8)Ǻ, β 93.01(3)°, Z 8. Crystals of (9) which contain carbon disulfide are monoclinic, A2/a, a 21.21(2), b 6.181(4), c 20.35(2) Ǻ, β 102.77(7)°, Z 4. Crystals of (10) are monoclinic, P21/n, a 7.540(2), b 4.392(2), c 14.770(4) Ǻ, β 96.29(2)°, Z 2. Crystals of (11) are monoclinic, P1/n, a 14.820(4), b 15.000(3), c 10.819(4)Ǻ, β 106.02(2)°, Z 4.

scholarly journals How does the acidic milieu interfere in the capability of ruthenium nitrosyl complexes to release nitric oxide?

2020 ◽  
Vol 44 (3) ◽  
pp. 773-779
Author(s):  
Renato Pereira Orenha ◽  
Nelson Henrique Morgon ◽  
Julia Contreras-García ◽  
Graziele Cappato Guerra Silva ◽  
Glaucio Régis Nagurniak ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Ruthenium Complexes ◽  
Reduction Reaction ◽  
Nitrosyl Complexes ◽  
Ruthenium Nitrosyl ◽  
Release Mechanisms ◽  
No Release

The nitric oxide has a well-defined role in biology. The ruthenium complexes are model for study NO release mechanisms. The proton increases the capability of these compounds to release NO after reduction reaction or of the light supported reaction.

X-ray Crystal Structures ofMoorella thermoaceticaFprA. Novel Diiron Site Structure and Mechanistic Insights into a Scavenging Nitric Oxide Reductase†,‡

Biochemistry ◽  
2005 ◽  
Vol 44 (17) ◽  
pp. 6492-6501 ◽  
Author(s):  
Radu Silaghi-Dumitrescu ◽  
Donald M. Kurtz, ◽  
Lars G. Ljungdahl ◽  
William N. Lanzilotta
Keyword(s):  
Nitric Oxide ◽  
Crystal Structures ◽  
Nitric Oxide Reductase ◽  
Site Structure ◽  
X Ray ◽  
Diiron Site

Composite host lattices of 4,4′-sulfonyldibenzoate water/boric acid in two tetrapropylammonium inclusion compounds

2018 ◽  
Vol 74 (9) ◽  
pp. 1026-1031
Author(s):  
Xiangxiang Wu ◽  
Huahui Zeng ◽  
Yunxia Yang
Keyword(s):  
Boric Acid ◽  
Small Molecules ◽  
Crystal Structures ◽  
Inclusion Compounds ◽  
X Ray Diffraction ◽  
X Ray ◽  
Counter Ions ◽  
Proton Donors ◽  
The Difference ◽  
Host Lattices

Two novel inclusion compounds of 4,4′-sulfonyldibenzoate anions and tetrapropylammonium cations with different ancillary molecules of water and boric acid, namely bis(tetrapropylammonium) 4,4′-sulfonyldibenzoate dihydrate, 2C12H28N+·C14H8O6S2−·H2O (1), and bis(tetrapropylammonium) 4,4′-sulfonyldibenzoate bis(boric acid), 2C12H28N+·C14H8O6S2−·2H3BO3 (2), were prepared and characterized using single-crystal X-ray diffraction. In the two salts, the host 4,4′-sulfonyldibenzoic acid molecules, which are converted to the corresponding anions under basic conditions, can be regarded as proton acceptors which link different proton donors of the ancillary molecules of water or boric acid. In this way, an isolated hydrogen-bonded tetramer is constructed in salt 1 and a ribbon is constructed in salt 2. The tetramers and ribbons are then packed in a repeating manner to generate various host frameworks, and the tetrapropylammonium guest counter-ions are contained in the cavities of the host lattices to give the final stable crystal structures. In these two salts, although the host anion and guest cation are the same, the difference in the ancillary small molecules results in different structures, indicating the significance of ancillary molecules in the formation of crystal structures.

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