Phosphites of some trivalent metals from the first transition series

1979 ◽  
Vol 44 (9) ◽  
pp. 2737-2742 ◽  
Author(s):  
Miroslav Ebert ◽  
Ladislav Kavan
Keyword(s):  
Hydrogen Bonds ◽  
Ambient Temperature ◽  
Hyperfine Splitting ◽  
Solid Phase ◽  
The Other ◽  
Epr Spectrum ◽  
Crystal Water ◽  
Transition Series ◽  
Water Hydrogen ◽  
Trivalent Metals

The phosphites M2(HPO3)3 . 7H2O (M = V, Cr), MH3P2O6 . 3 H2O (M = V, Mn) and H3[Cr(HPO3)3 . 10 H2O were studied in the solid phase by means of the thermography, magnetochemistry, and spectroscopy (IR, EPR, electronic reflection) techniques. The EPR spectrum of V2(HPO3)3 . 7H2O at ambient temperature displays hyperfine splitting arising from the nucleus 51V. In the phosphites H3[Cr(HPO3)3] . 10H2O, MnH3P2O6 . 3H2O, and probably also VH3P2O6 . 3H2O, in contrast to the other hithero studied hydrogenphosphites, coordination of the HPO2-3 anions occurs. These anions from which the molecules of the crystal water hydrogen bonds of the energy 40kJ mol-1. The Jorgensen's parameters of the ligand in the tris(phosphito)chromate(III) anion are f = 0.95 and h = 1.50.

scholarly journals Tetraquinolinium ditelluro(VI)octavanadate(V) octahydrate

2013 ◽  
Vol 69 (11) ◽  
pp. m595-m596
Author(s):  
Sirine Toumi ◽  
Samah Akriche Toumi ◽  
Mohamed Rzaigui
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
The Other ◽  
Water Molecules ◽  
Stacking Interactions ◽  
Compound C ◽  
Dimensional Network ◽  
Water Hydrogen

In the title compound, (C9H8N)4[Te2V8O28]·8H2O, the complete heteropolyanion is generated by a crystallographic inversion centre. One of the two quniolinium ions forms an N—H...Op(p = polyoxidometallate) hydrogen bond and the other an N—H...Ow(w = water) hydrogen bond. The water molecules further link the components by O—H...Opand O—H...Owhydrogen bonds. A number of C—H...O interactions and aromatic π–π stacking interactions [shortest centroid–centroid separation = 3.541 (7) Å] are also observed. Together, these generate a three-dimensional network.

Oxytocin analogues with non-coded amino acid residues in position 8: [8-Neopentylglycine]oxytocin and [8-cycloleucine]oxytocin

1987 ◽  
Vol 52 (9) ◽  
pp. 2317-2325 ◽  
Author(s):  
Jan Hlaváček ◽  
Jan Pospíšek ◽  
Jiřina Slaninová ◽  
Walter Y. Chan ◽  
Victor J. Hruby
Keyword(s):  
Amino Acid ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
The Other ◽  
Amino Acid Residues ◽  
Phase Synthesis ◽  
Other Hand ◽  
Fragment Condensation

[8-Neopentylglycine]oxytocin (II) and [8-cycloleucine]oxytocin (III) were prepared by a combination of solid-phase synthesis and fragment condensation. Both analogues exhibited decreased uterotonic potency in vitro, each being about 15-30% that of oxytocin. Analogue II also displayed similarly decreased uterotonic potency in vivo and galactogogic potency. On the other hand, analogue III exhibited almost the same potency as oxytocin in the uterotonic assay in vivo and in the galactogogic assay.

Comparison of the Potency of 8-L-Arginine, 8-D-Arginine and 8-D-Homoarginine Vasopressin Analogs with Substituted Phenylalanine in Position 2

1994 ◽  
Vol 59 (6) ◽  
pp. 1439-1450 ◽  
Author(s):  
Miroslava Žertová ◽  
Jiřina Slaninová ◽  
Zdenko Procházka
Keyword(s):  
Amino Acid ◽  
Solid Phase Synthesis ◽  
Solid Phase ◽  
Basic Amino Acid ◽  
The Other ◽  
Side Chain ◽  
Inhibitory Potency ◽  
Phase Synthesis ◽  
Other Hand ◽  
Order Of Magnitude

An analysis of the uterotonic potencies of all analogs having substituted L- or D-tyrosine or -phenylalanine in position 2 and L-arginine, D-arginine or D-homoarginine in position 8 was made. The series of analogs already published was completed by the solid phase synthesis of ten new analogs having L- or D-Phe, L- or D-Phe(2-Et), L- or D-Phe(2,4,6-triMe) or D-Tyr(Me) in position 2 and either L- or D-arginine in position 8. All newly synthesized analogs were found to be uterotonic inhibitors. Deamination increases both the agonistic and antagonistic potency. In the case of phenylalanine analogs the change of configuration from L to D in position 2 enhances the uterotonic inhibition for more than 1 order of magnitude. The L to D change in position 8 enhances the inhibitory potency negligibly. Prolongation of the side chain of the D-basic amino acid in position 8 seems to decrease slightly the inhibitory potency if there is L-substituted amino acid in position 2. On the other hand there is a tendency to the increase of the inhibitory potency if there is D-substituted amino acid in position 2.

scholarly journals Syntheses of two deacetyl-thymosin β4analogs and their anti-inflammatory effect on carrageenin-induced edema in the mouse paw

2001 ◽  
Vol 10 (2) ◽  
pp. 89-92 ◽  
Author(s):  
T. Abiko ◽  
R. Ogawa
Keyword(s):  
Marked Reduction ◽  
Solid Phase ◽  
The Other ◽  
Para Position ◽  
Phase Method ◽  
Antiinflammatory Effect ◽  
Solid Phase Method ◽  
Anti Inflammatory ◽  
Inflammatory Effect

Two {Met(0)6}deacetyl-thymosin β4analogs containing Phe(4F) or Tyr(Me) at position 12 were synthesized by the manual solid-phase method, and their anti-inflammatory effect on carrageenin-induced edema in the mouse paw was studied. Fluorination of the para-position of Phe12resulted in a marked antiinflammatory effect on carrageenin-induced edema in the mouse paw compared with that of our synthetic {Met(0)6}deacetyl-thymosin β4, but the other analog, {Met(0)6, Tyr(Me)12}deacetyl-thymosin β4, showed a marked reduction of the anti-inflammatory effect.

Ab initio QM/MM dynamics of anion–water hydrogen bonds in aqueous solution

2005 ◽  
Vol 403 (4-6) ◽  
pp. 314-319 ◽  
Author(s):  
Anan Tongraar ◽  
Bernd Michael Rode
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Bonds ◽  
Ab Initio ◽  
Water Hydrogen

Hypothermia in iron deficiency due to altered triiodothyronine metabolism

1980 ◽  
Vol 239 (5) ◽  
pp. R377-R381 ◽  
Author(s):  
E. Dillman ◽  
C. Gale ◽  
W. Green ◽  
D. G. Johnson ◽  
B. Mackler ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Iron Deficiency ◽  
Ambient Temperature ◽  
The Other ◽  
Other Hand ◽  
Iron Deficient ◽  
Catecholamine Response ◽  
Cutaneous Vasoconstriction

Iron-deficient rats become hypothermic and have an excessive catecholamine response when exposed to an ambient temperature of 4 degrees C. This is not due to changes in body insulation, since thickness is unaltered, since differences persist after removal of hair, and since cutaneous vasoconstriction is intact. On the other hand, oxygen consumption of iron-deficient animals at 4 degrees C is reduced, 39 +/- 3 ml . kg-1 . min-1 compared to 63 +/- 2 in control animals. Thyroxine (T4) values at 4 degrees C were 4.34 +/- 0.20 microgram/dl sera as compared to control values of 3.6 +/- 0.32. Triiodothyronine (T3) values of iron-deficient animals in the cold were 48 +/- 6.8 ng/dl as compared to 72 +/- 5.6 in control animals. Treatment of iron-deficient animals with iron was shown to normalize the plasma T3 response at 4 degrees C within 6 days. Thyroidectomized iron-deficient animals injected with T3 did not show hypothermia at 4 degrees C, whereas thyroidectomized iron-deficient animals injected with T4 showed hypothermia, increased catecholamines, and decreased T3 levels as compared to non-iron-deficient animals similarly treated. It is proposed that iron deficiency impairs conversion of T4 to T3 and that this is primarily responsible for the hypothermia observed.

Enhancement of Efficiency of the Ural Region Surface Water Sources Water Treatment in Terms of Metal Ions and their Compounds

2012 ◽  
pp. 96-108
Author(s):  
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Metal Ions ◽  
Water Purification ◽  
Solid Phase ◽  
Ural Region ◽  
Iron Aluminum ◽  
High Degree ◽  
Water Hydrogen ◽  
Sorption Characteristics

Sorption characteristics of “Ekozol-401” high-dispersed solid-phase agent in water solutions containing ions of iron, aluminum and manganese have been studied. Influence of the sorbent content, extracted metals’ concentration, saline background, hardness and alkalinity, water hydrogen indicator value as well as amount of modifier contained in the solid-phase agent have been stated. High degree of water purification in terms of the said ions has been demonstrated.

scholarly journals Two New Polyiodides in the 4,4´-Bipyridinium Diiodide/Iodine System

2012 ◽  
Vol 67 (1) ◽  
pp. 5-10
Author(s):  
Guido J. Reiss ◽  
Martin van Megen
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Complex I ◽  
The Other ◽  
Cyclic Dimer ◽  
Water Molecules ◽  
Spectroscopic Methods ◽  
Halogen Bonds ◽  
One Dimensional ◽  
Hydroiodic Acid

The reaction of bipyridine with hydroiodic acid in the presence of iodine gave two new polyiodide-containing salts best described as 4,4´-bipyridinium bis(triiodide), C10H10N2[I3]2, 1, and bis(4,4´-bipyridinium) diiodide bis(triiodide) tris(diiodine) solvate dihydrate, (C10H10N2)2I2[I3]2 · 3 I2 ·2H2O, 2. Both compounds have been structurally characterized by crystallographic and spectroscopic methods (Raman and IR). Compound 1 is composed of I3 − anions forming one-dimensional polymers connected by interionic halogen bonds. These chains run along [101] with one crystallographically independent triiodide anion aligned and the other triiodide anion perpendicular to the chain direction. There are no classical hydrogen bonds present in 1. The structure of 2 consists of a complex I144− anion, 4,4´-bipyridinium dications and hydrogen-bonded water molecules in the ratio of 1 : 2 : 2. The I144− polyiodide anion is best described as an adduct of two iodide and two triiodide anions and three diiodine molecules. Two 4,4´-bipyridinium cations and two water molecules form a cyclic dimer through N-H· · ·O hydrogen bonds. Only weak hydrogen bonding is found between these cyclic dimers and the polyiodide anions.

Three new phosphoric triamides with a [C(O)NH]P(O)[N(C)(C)]2skeleton: a database analysis of C—N—C and P—N—C bond angles

2014 ◽  
Vol 70 (10) ◽  
pp. 998-1002 ◽  
Author(s):  
Mehrdad Pourayoubi ◽  
Atekeh Tarahhomi ◽  
Arnold L. Rheingold ◽  
James A. Golen
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
The Other ◽  
Database Analysis ◽  
Acta Cryst ◽  
Bond Angles ◽  
Cyclic Amide ◽  
Phosphoric Triamide ◽  
Structural Database ◽  
Phosphoric Triamides

InN,N,N′,N′-tetraethyl-N′′-(4-fluorobenzoyl)phosphoric triamide, C15H25FN3O2P, (I), andN-(2,6-difluorobenzoyl)-N′,N′′-bis(4-methylpiperidin-1-yl)phosphoric triamide, C19H28F2N3O2P, (II), the C—N—C angle at each tertiary N atom is significantly smaller than the two P—N—C angles. For the other new structure,N,N′-dicyclohexyl-N′′-(2-fluorobenzoyl)-N,N′-dimethylphosphoric triamide, C21H33FN3O2P, (III), one C—N—C angle [117.08 (12)°] has a greater value than the related P—N—C angle [115.59 (9)°] at the same N atom. Furthermore, for most of the analogous structures with a [C(=O)NH]P(=O)[N(C)(C)]2skeleton deposited in the Cambridge Structural Database [CSD; Allen (2002).Acta Cryst.B58, 380–388], the C—N—C angle is significantly smaller than the two P—N—C angles; exceptions were found for four structures with theN-methylcyclohexylamide substituent, similar to (III), one structure with the seven-membered cyclic amide azepan-1-yl substituent and one structure with anN-methylbenzylamide substituent. The asymmetric units of (I), (II) and (III) contain one molecule, and in the crystal structures, adjacent molecules are linkedviapairs of N—H...O=P hydrogen bonds to form dimers.

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