Complexes of Bis(cyclopentadienyl)titanium(III) chloride with some bidentate ligands

1968 ◽  
Vol 21 (9) ◽  
pp. 2199 ◽  
Author(s):  
RS Coutts ◽  
PC Wailes
Keyword(s):  
Organic Solvents ◽  
Free Water ◽  
Bidentate Ligand ◽  
Bidentate Ligands ◽  
Anhydrous Tetrahydrofuran ◽  
The Common

Bis(cyclopentadienyl)titanium(111) chloride (cp2TiCl) complexes with 1,l0-phenanthroline (phen), 2,2?-dipyridyl (dipy), o-phenylenediamine (phm), and α-picolylamine (picam) in anhydrous tetrahydrofuran to give cp2TiCl,1.5L where L is the bidentate ligand. In air-free water all showed the conductivity of 1 : 1 electrolytes, but were insoluble in the common organic solvents.

scholarly journals A new lanthanum(III) complex containing acetylacetone and 1H-imidazole

2017 ◽  
Vol 73 (11) ◽  
pp. 1739-1742 ◽  
Author(s):  
Atsuya Koizumi ◽  
Takuya Hasegawa ◽  
Atsushi Itadani ◽  
Kenji Toda ◽  
Taoyun Zhu ◽  
...  
Keyword(s):  
Bidentate Ligand ◽  
Bidentate Ligands ◽  
Monodentate Ligand ◽  
Intermolecular Hydrogen Bonds ◽  
Molecular Plane ◽  
One Dimensional ◽  
Nitrate N ◽  
Dimensional Network ◽  
Monodentate Ligands ◽  
Nitrate Anions

In the title complex, diaqua(1H-imidazole-κN3)(nitrato-κ2O,O′)bis(4-oxopent-2-en-2-olato-κ2O,O′)lanthanum(III), [La(C5H7O2)2(NO3)(C3H4N2)(H2O)2], the La atom is coordinated by eight O atoms of two acetylacetonate (acac) anions acting as bidentate ligands, two water molecule as monodentate ligands, one nitrate anions as a bidentate ligand and one N atom of an imidazolate (ImH) molecule as a monodentate ligand. Thus, the coordination number of the La atom is nine in a monocapped square antiprismatic polyhedron. There are three types of intermolecular hydrogen bonds between ligands, the first involving nitrate–water O...H—O interactions running along the [001] direction, the second involving acac–water O...H—O interactions along the [010] direction and the third involving an Im–nitrate N—H...O interaction along the [100] direction (five interactions of this type). Thus, an overall one-dimensional network structure is generated. The molecular plane of an ImH molecule is almost parallel to that of a nitrate ligand, making an angle of only 6.04 (12)°. Interestingly, the ImH plane is nearly perpendicular to the planes of two neighbouring acac ligands.

Does Anoxia Induce Cell Swelling in Carp Brains? In Vivo MRI Measurements in Crucian Carp and Common Carp

2001 ◽  
Vol 85 (1) ◽  
pp. 125-133 ◽  
Author(s):  
Annemie Van der Linden ◽  
Marleen Verhoye ◽  
Göran E. Nilsson
Keyword(s):  
Common Carp ◽  
Crucian Carp ◽  
Free Water ◽  
Cell Swelling ◽  
Brain Swelling ◽  
Energy Deficiency ◽  
Water Homeostasis ◽  
The Common ◽  
Magnetic Resonance Imaging Mri

Although both common and crucian carp survived 2 h of anoxia at 18°C, the response of their brains to anoxia was quite different and indicative of the fact that the crucian carp is anoxia tolerant while the common carp is not. Using in vivo T2 and diffusion-weighted magnetic resonance imaging (MRI), we studied anoxia induced changes in brain volume, free water content (T2), and water homeostasis (water diffusion coefficient). The anoxic crucian carp showed no signs of brain swelling or changes in brain water homeostasis even after 24 h except for the optic lobes, where cellular edema was indicated. The entire common carp brain suffered from cellular edema, net water gain, and a volume increase (by 6.5%) that proceeded during 100 min normoxic recovery (by 10%). The common carp recovered from this insult, proving that the changes were reversible and suggesting that the oversized brain cavity allows brain swelling during energy deficiency without a resultant increase in intracranial pressure and global ischemia. It is tempting to suggest that this is a function of the large brain cavity seen in many ectothermic vertebrates.

scholarly journals Technetium Nitrido-Peroxo Complexes: An Unexplored Class of Coordination Compounds

Inorganics ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 142
Author(s):  
Micol Pasquali ◽  
Emilija Janevik-Ivanovska ◽  
Adriano Duatti
Keyword(s):  
Mass Spectroscopy ◽  
Elemental Analysis ◽  
Coordination Compounds ◽  
Bidentate Ligand ◽  
Bidentate Ligands ◽  
Peroxo Complexes ◽  
Substitution Reactions ◽  
No Carrier Added

The purpose of this work was to further expand the chemistry of mixed technetium nitrido-peroxo complexes, a still poorly explored class of compounds containing the Tc(VII) moiety, [99gTc][Tc(N)(O2)2]. A number of novel complexes of the formula [99gTc][Tc(N)(O2)2(L)] with bidentate ligands (L) (where L = deprotonated alanine, glycine, proline) were prepared by reacting a solution of nitrido-technetic(VI) acid with L in the presence of a source of H2O2. Alternatively, the complex [99gTc][Tc(N)(O2)2X]− (X = Cl, Br) was used as a precursor for substitution reactions where the halogenide ion was replaced by the bidentate ligand. The new complexes were characterized by elemental analysis and mass spectroscopy. The preparation of the analogous [99mTc][Tc(N)(O2)2] moiety, radiolabeled with the metastable isomer Tc-99m, was also studied at a no-carrier-added level, using S-methyl-N-methyl-dithiocarbazate as the donor of the nitrido nitrogen atoms.

Mixed Ligand Derivatives of 1: 1 Th(IV)—DTPA Chelate with Some Hydroxy Acids(H)

1975 ◽  
Vol 30 (9-10) ◽  
pp. 751-754 ◽  
Author(s):  
O. P. Pachauri ◽  
J. P. Tandon
Keyword(s):  
Formation Constants ◽  
Bidentate Ligand ◽  
Mixed Ligand ◽  
Bidentate Ligands ◽  
Hydroxy Acids ◽  
Titration Curves ◽  
Hydroxy Quinoline ◽  
Derivatives Of ◽  
Sulphosalicylic Acid ◽  
Secondary Ligand

Studies of the interaction between 1:1 Th(IV)-DTPA chelate (where DTPA = diethylenetriaminepentaacetic acid) with certain bidentate ligands, such as salicylic acid (SA), 5-sulphosalicylic acid (SSA) and 8-hydroxy quinoline-5-sulphonic acid (HQSA) have been carried out potentiometrically. The nature of the titration curves indicates that the bidentate ligand is added stepwise to the initially formed metal diethylenetriaminepentaacetate. The formation constants (log KMAB) of the resulting 1:1:1 mixed ligand derivatives have been determined at 30 ± 1 °C and μ = 0.1 (KNO3). The order of stability in terms of the secondary ligand has been found to be SA > SSA > HQSA.

Organomercury compounds. VII. Complexes of arylmercuric halides with bidentate ligands

1968 ◽  
Vol 21 (7) ◽  
pp. 1757 ◽  
Author(s):  
AJ Canty ◽  
GB Deacon
Keyword(s):  
Organometallic Compounds ◽  
Bidentate Ligand ◽  
Chemistry Department ◽  
Bidentate Ligands ◽  
Solution Studies ◽  
Unknown Structure ◽  
Organomercury Compounds ◽  
Neutral Ligands ◽  
Mercuric Halides ◽  
Low Solubility

The complexes, C6F5HgXL2 [X = Br or C1; L2 = 2,2'-bipyridyl (bipy), 1,l0-phenanthroline (phen), 3,4,7,8-tetramethyl-1,l0-phenanthroline (tmp), or 2,9-dimethyl-1,l0-phenanthroline (dmp)], C6Cl5HgClL2 (L, = phen, tmp, or dmp), and PhHgClL2 (L2 = phen or tmp), have been prepared, but attempts to prepare PhHgCl bipy or complexes of phenylmercuric bromide were unsuccessful. Evidence that the complexes contain four coordinate mercury has been obtained from infrared spectroscopy. All complexes, except C6Cl5HgCl phen, C6Cl5HgCl dmp, and PhHgCl tmp, undergo complete or partial disproportionation reactions, 2RHgXL2 → L2HgX2 +R2HgL2 (or R2Hg + L2), in boiling benzene. Although disproportionation or low solubility precludes solution studies on the majority of the derivatives, it has been shown that C6F5HgX dmp complexes are monomeric in acetone and that PhHgCl phen undergoes dissociation, PhHgCl phen + PhHgCl + phen, in this solvent. Four-coordinate complexes of mercuric halides with neutral ligands, L,HgX, (L = a neutral unidentate or L, = a neutral bidentate ligand; X = C1, Br, or I), are well kno~n,l-~ but analogous complexes of organomercuric halides, viz. RHgXL,, were unknown prior to this investigation. Reactions of organomercuric halides with ligands generally result in disproportionation, the corresponding diorganomercurial and mercuric halide complex being f~rmed.~-~ In some cases intermediate complexes RHgL+X- have been i~olated~,~ or detected in soluti~n,~-~~ and a 1 : 1 complex of unknown structure between pyridine and cis-2- * Part VI, J. organomet. Chem., in press. Preliminary communications for Part VII: Canty, A. J., Deacon, G. B., and Felder, P. W., Inorg. nzlcl. Chem. Lett., 1967,3,263; Deacon, G. B., and Canty, A. J., Inorg. %ucl. Chem. Lett., 1968, 4, 128. t Chemistry Department, Monash University, Clayton, Vie. 3168. Evans, R. C., Mann, F. G., Peiser, H. S., and Purdie, D., J. chem. Soc., 1940, 1209. Cass, R. C., Coates, G. E., and Hayter, R. G., J. chem. Soc., 1955, 4007. Coates, G. E., and Ridley, D., J. chem. Soc., 1964, 166. Coates, G. E. "Organometallic Compounds." 2nd. Edn, pp. 78-82. (Methuen: London 1960.) Seyferth, D., and Towe, R. H., Inorg. Chem., 1962, 1, 185. Coates, G. E., and Lauder, A., J. chem. Soc., 1965, 1857. Brodersen, K., Chem. Ber., 1957, 90, 2703. Schwarzenbach, G., and Schellenberg, &I., Helv. chim. Acta, 1965, 48, 28. Goggin, P. L., and Woodward, L. A., Trans. Faraday Soc., 1962, 58, 1495. Dessy, R. E., Budde, W. L., and Woodruff, C., J. Am. chem. Soc., 1962, 84, 1172. Aust. J. Chem., 1968, 21, 1757-67

Improving Prospect Evaluation by Integration Saturation Height Function into The Resource Assessment Workflow

2020 ◽  
Author(s):  
Y. Sugiharto
Keyword(s):  
Water Saturation ◽  
Free Water ◽  
Height Function ◽  
Resource Assessment ◽  
New Venture ◽  
Earth Model ◽  
Petrophysical Model ◽  
Initial Setting ◽  
The Common ◽  
Monte Carlo Simulation Model

This paper will discuss saturation modelling weighted by area-depth and to determine a field’s hydrocarbon in place, it is necessary to model the distribution of hydrocarbon and water throughout the reservoir. Results comparison to “average” saturation values obtained from reservoir summation are also described to improve the prospect evaluation. The unconventional approach of water saturation determined using SHF weighted to volume is in the appreciation of 3D earth model, applicating the distribution of saturation 360-degree geometry, and addressing the reservoir heterogeneity. The common saturation values are obtained from reservoir summation with applied petrophysical cut-off. The workflow to estimate the potential resources of an exploration opportunity usually begins with a geophysicist interpreting seismic. Then, a geologist constructs a geological model with which to calculate hydrocarbon in place. As petrophysical data tends to be sparse in most new venture areas, petrophysicists are seldom called on to help in the process. This omission leads to major errors in the prospect evaluation. The problem stems from lack of communication and understanding between the various disciplines contributing to the various parts of the workflow. The SHF greatly impacts resource calculations and is used by geologists to predict the saturation in the reservoir for a given height above the free water level. Many bad practices occur in the initial setting up of Monte Carlo simulation model of hydrocarbon-in-place. For example, failure to consider the petrophysical model leads to incorrect distributions of the input parameters, neglecting to link dependent petrophysical parameters, and using “average” saturation values and ignoring height dependency.

Structural and spectroscopic studies of transition metal nitrite complexes. X. Crystal structures of cis-Bis(2,2'-bipyridine)(nitrito-O,O')nickel(II) nitrate and hydrated Tris(2,2'-bipyridine)nickel(II) nitrite/nitrate and sulfate. Stereochemistry of the [M(bidentate ligand)2(bidentate ligand')1] system

1981 ◽  
Vol 34 (10) ◽  
pp. 2177 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
DL Kepert ◽  
CL Raston ◽  
GL Rowbottom ◽  
...  
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Coordination Sphere ◽  
Nickel Atom ◽  
Spectroscopic Studies ◽  
Bidentate Ligand ◽  
The Other ◽  
Bidentate Ligands ◽  
Nitrite Nitrate ◽  
Oxygen Atoms

The crystal structures of the title compounds are reported. In all cases, the coordination sphere of the nickel atom comprises three bidentate ligands. In (1), [Ni(bpy)2(O2N)] NO3, (Ni-N) is 2.M2 � although there are small differences between those nitrogen atoms trans to the nitrite oxygen atoms and the other two. (Ni-O) is 2.12 �. In (2), [Ni(bpy)3] NO2/NO3,xH2O, and (3), [Ni(bpy)3]- SO4,7.5H2O, a redetermination, Ni-N is shown to be c. 2.09 �; serious disorder is present among the non-cationic components of (2), precluding a definite assignment of stoichiometry.

scholarly journals Photoisomerization and thermal isomerization of ruthenium aqua complexes with chloro-substituted asymmetric bidentate ligands

RSC Advances ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 2002-2010 ◽  
Author(s):  
Masanari Hirahara ◽  
Hiroki Goto ◽  
Rei Yamamoto ◽  
Masayuki Yagi ◽  
Yasushi Umemura
Keyword(s):  
Thermal Isomerization ◽  
Bidentate Ligand ◽  
Bidentate Ligands ◽  
Aqua Complexes

Introduction of a chloro substituent to the bidentate ligand of ruthenium aqua complexes enhanced photoisomerization and thermal back-isomerization.

Stereochemistry of six coordinate organotin(IV) compounds with bidentate ligands

1979 ◽  
Vol 57 (17) ◽  
pp. 2223-2229 ◽  
Author(s):  
J. S. Tse ◽  
T. K. Sham ◽  
G. M. Bancroft
Keyword(s):  
Bidentate Ligand ◽  
Bidentate Ligands ◽  
Electronic Effects ◽  
Bite Size ◽  
Bond Angles ◽  
Bent’S Rule

Extended ligand–ligand repulsion calculations have been applied to a number of six coordinate organotin complexes of the type RR′Sn(bidentate)2 (R, R′ = Me, Ph, Cl). Qualitatively, the calculations readily predict the decrease in the R—Sn—R′ angle with decrease in bite size of the bidentate ligand. The steric calculations are generally successful in predicting both the cis–trans preference of the R groups and the bond angles about the Sn atom. For the Me2Sn complexes, electronic effects (as expressed by Bent's rule) sometimes have to be used in conjunction with the steric calculations to rationalize the observed stereochemistry.

scholarly journals C,C- and C,N-Chelated Organocopper Compounds

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5806
Author(s):  
Liang Liu ◽  
Hui Chen ◽  
Zhenqiang Yang ◽  
Junnian Wei ◽  
Zhenfeng Xi
Keyword(s):  
Rational Design ◽  
Deep Understanding ◽  
Ion Pair ◽  
Bidentate Ligand ◽  
Macrocyclic Compounds ◽  
Bidentate Ligands ◽  
Function Relationship ◽  
Cyclic Compounds ◽  
Relationship Of ◽  
Structural Characterizations

Copper-catalyzed and organocopper-involved reactions are of great significance in organic synthesis. To have a deep understanding of the reaction mechanisms, the structural characterizations of organocopper intermediates become indispensable. Meanwhile, the structure-function relationship of organocopper compounds could advance the rational design and development of new Cu-based reactions and organocopper reagents. Compared to the mono-carbonic ligand, the C,N- and C,C-bidentate ligands better stabilize unstable organocopper compounds. Bidentate ligands can chelate to the same copper atom via η2-mode, forming a mono-cupra-cyclic compounds with at least one acute C-Cu-C angle. When the bidentate ligands bind to two copper atoms via η1-mode at each coordinating site, the bimetallic macrocyclic compounds will form nearly linear C-Cu-C angles. The anionic coordinating sites of the bidentate ligand can also bridge two metals via μ2-mode, forming organocopper aggregates with Cu-Cu interactions and organocuprates with contact ion pair structures. The reaction chemistry of some selected organocopper compounds is highlighted, showing their unique structure–reactivity relationships.

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