29 research outputs found
One-Pot Synthesis of Ruthenium Metallacycles via Oxidative Addition of Diaryldichalcogen and Halogen across a Ru-Ru Bond
Oxidative addition of diaryldichalcogen ligands (REER) to ruthenium carbonyl (Ru-3(CO)(12)) followed by the addition of halogen (X-2) afforded chalcogen-bridged Ru(II)-based metallacycles of general formula [X(CO)(3)Ru(mu-ER)(2)Ru-(CO)(3)X] (1-10), where E = S, Se, and Te; R = phenyl, tolyl, and benzyl; and X = Br and I. Compounds 1-10 were characterized using IR, UV-vis, and NMR spectroscopic techniques. Molecular structures of the metallacycles have been elucidated by single-crystal X-ray diffraction methods that confirm the dimeric nature of metallacycles, wherein the two Ru(CO)(3)X moieties are held together by the bridging aryl chalcogenide ligands
Synthesis, spectral and molecular studies of half-sandwich arene ruthenium and Cp*Rh/Cp*Ir complexes containing bidentate P-N and EāN ligands (E = S, Se) based on diphenyl(2-pyridyl)phosphine
<div><p>The chalcogenide ligands {E=PPh<sub>2</sub>Py} (EĀ =Ā O, S, Se) were prepared by direct oxidation of diphenyl(2-pyridyl)phosphine using H<sub>2</sub>O<sub>2</sub>, S, and Se powder, respectively. The reaction of ligand with starting metal precursors [(arene)RuCl<sub>2</sub>]<sub>2</sub> {MĀ =Ā Ru, areneĀ =Ā benzene; <i>p</i>-cymene} and [Cp*MCl<sub>2</sub>]<sub>2</sub> (MĀ =Ā Rh, Ir) afforded a series of cationic half-sandwich complexes, [(arene/Cp*)MCl{<i>Īŗ</i><sup>2</sup>-(<i>NE</i>)-EPPh<sub>2</sub>Py)}]<sup>+</sup>. Reaction of O=PPh<sub>2</sub>Py with precursors yielded known complexes [(arene/Cp*)MCl{<i>Īŗ</i><sup>2</sup>-(<i>PN</i>)-PPh<sub>2</sub>Py)}]<sup>+</sup> instead of expected complexes [(arene/Cp*)MCl{<i>Īŗ</i><sup>2</sup>-(<i>NO</i>)-O=PPh<sub>2</sub>Py)}]<sup>+</sup>. All new complexes were isolated as counterion and characterized by spectroscopic techniques like FT-IR, NMR, mass, and UVāvis. Some representative complexes were structurally determined by X-ray crystallographic analysis, revealing typical three-legged piano stool geometry around the metal center with a five-membered metallacycle.</p></div
Synthesis, Structural Characterization, and HostāGuest Studies of Aminoquinonato-Bridged Re(I) Supramolecular Rectangles
Aminoquinonato
bridged ReĀ(I)-based metallarectangles have been constructed via an
orthogonal bonding approach. Self-assembly of Re<sub>2</sub>(CO)<sub>10</sub> and aminoquinone ligands in the presence of ditopic linear
pyridyl ligands has resulted in the formation of metallarectangles
of the general formula [{(CO)<sub>3</sub>ReĀ(Ī¼-Ī·<sup>4</sup>-L)ĀReĀ(CO)<sub>3</sub>}<sub>2</sub>Ā(Ī¼-N-Lā²-N)<sub>2</sub>] (<b>1</b>ā<b>4</b>), wherein <b>1</b>, L = 2,5-bisĀ(<i>n</i>-butylamino)-1,4-benzoquinonato (bbbq)
and N-Lā²-N = 4,4ā²-bipyridine (bpy); <b>2</b>,
L = 2,5-bisĀ(phenethylamino)-1,4-benzoquinonato (bpbq) and N-Lā²-N
= 4,4ā²-bipyridine; <b>3</b>, L = 2,5-bisĀ(<i>n</i>-butylamino)-1,4-benzoquinonato (bbbq) and N-Lā²-N = <i>trans</i>-1,2-bisĀ(4-pyridyl)Āethylene (bpe) and <b>4</b>, L = 2,5-bisĀ(phenethylamino)-1,4-benzoquinonato (bpbq) and N-Lā²-N
= <i>trans</i>-1,2-bisĀ(4-pyridyl)Āethylene (bpe). Metallarectangles <b>1</b>ā<b>4</b> have been characterized by elemental
analysis, IR, NMR, and UVāvis absorption spectroscopic techniques.
The molecular structures of <b>1</b> and <b>4</b> were
determined by single-crystal X-ray diffraction methods. The molecular
recognition capability of <b>1</b> and <b>3</b> with pyrene
and triphenylene has been investigated using UVāvis absorption
and emission spectroscopic techniques. The formation of hostāguest
complex has been further corroborated by the single-crystal X-ray
structural evidence of carceplex system (<b>3</b>āpyrene)Ā·(DMF)
Synthesis and Spectroscopic and Structural Characterization of Oxamidato-Bridged Rhenium(I) Supramolecular Rectangles with Ester Functionalization
Oxamidato-bridged ReĀ(I)-based supramolecular
rectangles with an
ester functionality have been synthesized via an orthogonal bonding
approach under solvothermal conditions. Self-assembly of Re<sub>2</sub>(CO)<sub>10</sub> and oxamide ligands (H<sub>2</sub>L1 = <i>N</i>,<i>N</i>ā²-dibutyloxamide, H<sub>2</sub>L2 = <i>N</i>,<i>N</i>ā²-dioctyloxamide,
H<sub>2</sub>L3 = <i>N</i>,<i>N</i>ā²-didodecyloxamide,
and H<sub>2</sub>L4 = <i>N</i>,<i>N</i>ā²-dibenzyloxamide)
with the pyridyl ligand phenyl-1,4-bisĀ(isonicotinate) (pbin) has resulted
in the formation of metallarectangles of general formula [{(CO)<sub>3</sub>ReĀ(Ī¼-Ī·<sup>4</sup>-L)ĀReĀ(CO)<sub>3</sub>}<sub>2</sub>(Ī¼-pbin)<sub>2</sub>] (<b>1</b>ā<b>4</b>), wherein L = <i>N</i>,<i>N</i>ā²-dibutyloxamidato
(<b>1</b>), <i>N</i>,<i>N</i>ā²-dioctyloxamidato
(<b>2</b>), <i>N</i>,<i>N</i>ā²-didodecyloxamidato
(<b>3</b>), <i>N</i>,<i>N</i>ā²-dibenzyloxamidato
(<b>4</b>) and pbin = phenyl-1,4-bisĀ(isonicotinate). The metallarectangles
have been characterized using spectroscopic techniques, and single-crystal
X-ray structures have been obtained for <b>1</b> and <b>4</b>. The guest binding ability of <b>2</b> has been investigated
with a few aromatic amines and an amino ketone using electronic absorption
and fluorescence emission spectroscopy, and the results revealed a
strong binding interaction between hostāguest species. The
luminescence properties of <b>2</b> and <b>3</b> have
been tuned using organicāaqueous solvent mixtures
Synthesis, spectral and molecular studies of half-sandwich arene ruthenium and Cp*Rh/Cp*Ir complexes containing bidentate P-N and EāN ligands (E = S, Se) based on diphenyl(2-pyridyl)phosphine
Multicomponent Self-Assembly of Thiolato- and Selenato-Bridged Ester-Functionalized Rhenium(I)-Based Trigonal Metallaprisms: Synthesis and Structural Characterization
Multicomponent self-assembly of Re<sub>2</sub>(CO)<sub>10</sub>, diaryl dichalcogenide ligands (REER), and
phenyl-1,3,5-trisĀ(isonicotinate)
(ptin) under solvothermal conditions has resulted in the formation
of chalcogen-bridged trigonal metallaprisms of the general formula
[{(CO)<sub>3</sub>ReĀ(Ī¼-ER)<sub>2</sub>ReĀ(CO)<sub>3</sub>}<sub>3</sub>(Ī¼<sub>3</sub>-ptin)<sub>2</sub>] (<b>1</b>ā<b>5</b>), wherein E = S, Se and R = phenyl, <i>p</i>-tolyl,
benzyl. Oxidative addition of diaryl disulfide/diaryl diselenide to
Re<sub>2</sub>(CO)<sub>10</sub> with the ester-functionalized tritopic
linker ptin has yielded trigonal metallaprisms <b>1</b>ā<b>5</b> under facile reaction conditions. The metallaprisms <b>1</b>ā<b>5</b> have been characterized using elemental
analysis and IR, UVāvis, and NMR spectroscopic techniques.
Single-crystal X-ray structures have been obtained for <b>3</b> and <b>4</b>. The structural features and chirality of metallaprisms <b>3</b> and <b>4</b> in the solid state have been highlighted
Self-assembly of Thiolato-Bridged Manganese(I)-Based Metallarectangles: One-pot Synthesis and Structural Characterization
A new series of thiolato-bridged
manganeseĀ(I)-based supramolecular rectangles have been achieved by
three-precursor self-assembly of Mn<sub>2</sub>(CO)<sub>10</sub>,
diaryl disulfides (RSSR), and linear ditopic azine ligands (L) [L
= pyrazine (pz), 4,4ā²-bipyridine (bpy), and <i>trans</i>-1,2-bisĀ(4-pyridyl)Āethylene (bpe)] using a one-pot synthetic strategy.
Oxidative addition of RSSR (diphenyl disulfide and <i>p</i>-tolyl disulfide) to manganese decacarbonyl in the presence of rigid
bidentate ligands (L) afforded metallarectangles of the general formula
[{(CO)<sub>3</sub>MnĀ(Ī¼-SR)<sub>2</sub>MnĀ(CO)<sub>3</sub>}<sub>2</sub>(Ī¼-L)<sub>2</sub>] (<b>1</b>ā<b>6</b>). Compounds <b>1</b>ā<b>6</b> were characterized
using elemental analyses and NMR, IR, and UVāvis absorption
spectroscopic techniques. The molecular structures of metallarectangles <b>1</b>, <b>3</b>, and <b>5</b> were elucidated by single-crystal
X-ray diffraction methods. The guest binding ability of <b>3</b> and <b>5</b> has been investigated with two aromatic guests
using electronic absorption and fluorescence emission spectroscopy,
and the results revealed a strong binding interaction between hostāguest
species
One-Pot Synthesis of Ruthenium Metallacycles via Oxidative Addition of Diaryldichalcogen and Halogen across a RuāRu Bond
Oxidative addition of diaryldichalcogen
ligands (REER) to ruthenium carbonyl (Ru<sub>3</sub>(CO)<sub>12</sub>) followed by the addition of halogen (X<sub>2</sub>) afforded chalcogen-bridged
RuĀ(II)-based metallacycles of general formula [XĀ(CO)<sub>3</sub>RuĀ(Ī¼-ER)<sub>2</sub>RuĀ(CO)<sub>3</sub>X] (<b>1</b>ā<b>10</b>), where E = S, Se, and Te; R = phenyl, tolyl, and benzyl; and X
= Br and I. Compounds <b>1</b>ā<b>10</b> were characterized
using IR, UVāvis, and NMR spectroscopic techniques. Molecular
structures of the metallacycles have been elucidated by single-crystal
X-ray diffraction methods that confirm the dimeric nature of metallacycles,
wherein the two RuĀ(CO)<sub>3</sub>X moieties are held together by
the bridging aryl chalcogenide ligands
One-Pot Synthesis of Ruthenium Metallacycles via Oxidative Addition of Diaryldichalcogen and Halogen across a RuāRu Bond
Oxidative addition of diaryldichalcogen
ligands (REER) to ruthenium carbonyl (Ru<sub>3</sub>(CO)<sub>12</sub>) followed by the addition of halogen (X<sub>2</sub>) afforded chalcogen-bridged
RuĀ(II)-based metallacycles of general formula [XĀ(CO)<sub>3</sub>RuĀ(Ī¼-ER)<sub>2</sub>RuĀ(CO)<sub>3</sub>X] (<b>1</b>ā<b>10</b>), where E = S, Se, and Te; R = phenyl, tolyl, and benzyl; and X
= Br and I. Compounds <b>1</b>ā<b>10</b> were characterized
using IR, UVāvis, and NMR spectroscopic techniques. Molecular
structures of the metallacycles have been elucidated by single-crystal
X-ray diffraction methods that confirm the dimeric nature of metallacycles,
wherein the two RuĀ(CO)<sub>3</sub>X moieties are held together by
the bridging aryl chalcogenide ligands