Search results for "Reactivity"

Cardiorespiratory information dynamics during mental arithmetic and sustained attention

2015

An analysis of cardiorespiratory dynamics during mental arithmetic, which induces stress, and sustained attention was conducted using information theory. The information storage and internal information of heart rate variability (HRV) were determined respectively as the self-entropy of the tachogram, and the self-entropy of the tachogram conditioned to the knowledge of respiration. The information transfer and cross information from respiration to HRV were assessed as the transfer and cross-entropy, both measures of cardiorespiratory coupling. These information-theoretic measures identified significant nonlinearities in the cardiorespiratory time series. Additionally, it was shown that, alt…

Complexes of organothallium(III) with Cis-1,2-dicyanoethylenedithiolate ion and a ‘tripod’ ligand. Synthesis, infrared and proton magnetic resonance …

1980

Abstract The reaction of cis-1,2-dicyanoethylenedithiolate ion (mnt2− with organothallium(III) derivatives has been examined. The complexes [(CH3)2Tl]2mnt and [(C4H9)4N] [(C6H5)2Tl mnt] have been synthesized. The results seem to indicate a trend in reactivity similar to that of arylmercury(II) derivatives towards chelating agents with nucleophilic character. In addition, the complex [(CH3)2Tl(tren)] [BPh4] has been obtained as a test of the complexing ability of 2,2′, 2″-triaminotriethylamine(tren) towards organometallic moieties. I.r. and 1H n.m.r. are presented and discussed.

Properties and Reactivity of Hydroxides of Group 13 Elements In, Tl, and Nh from Molecular and Periodic DFT Calculations

2019

Adsorption energies, Eads, of gaseous hydroxides of In, Tl, and the superheavy element Nh on surfaces of Teflon and gold are predicted using molecular and periodic relativistic DFT calculations. Th...

Ambident Reactivity of P˭CH‒N‒Heterocycles: Lithiation and Substitution Sites

2011

Abstract Benzofused 1H-1,3-azaphospholes are lithiated at the N-atom by tBuLi but phosphinylation takes place at either the N- or the P-atom. Smaller chlorophosphines react at nitrogen, bulkier react at phosphorus. Substituents at C2 promote the latter mode. N-Substituted 2H-1,3-benzazaphospholes undergo CH-metalation or addition at the P˭C bond, depending on the conditions, and allow access to 2-functionally substituted benzazaphospholes or their 2,3-dihydro derivatives, new σ2P,X or σ3P,X hybrid ligands (X=O,P).

Cycloaddition von Benzothiet an 4‐substituierte Styrole

1989

Durch thermische Ringoffnung entsteht aus Benzothiet (1) ein 8-π-Elektronensystem 2, das mit den 4-substituierten Styrolen 3a–j die Cycloaddukte 4/5a–j bildet. Die Erhohung der Reaktivitat durch elektronenspendende oder elektronenanziehende Reste und die Einflusse auf die Regioselektivitat werden an Hand von Grenzorbitalbetrachtungen diskutiert. Cycloaddition of Benzothiete of 4-Substituted Styrenes By thermal ring opening benzothiete (1) generates an 8-π electron system 2, which forms the cycloadducts 4/5a–j with 4-substituted styrenes 3a–j. The enhancement of the reactivity by electrondonating as well as electron-withdrawing substituents and their influence on the regioselectivity are dis…

Ambident electrophilicity of 4‐nitrobenzochalcogenadiazoles: Kinetic studies and structure‐reactivity relationships

2020

Strukturanalytische Untersuchungen P-substituierter 1,3,2-Diazaphospholidine

2011

2-Diphenylphosphanyl-1,3,2-diazaphospholidines were prepared via metathesis from 2-chloro-1,3,2-diazaphospholidines and LiPPh2. For some of the products, symmetrisation to tetraphenyldiphosphane and 2,2′-bis-1,3,2-diazaphospholidinyls was observed. Most of the derivatives were characterised by single-crystal X-ray diffraction, which showed that all compounds studied feature elongated exocyclic P–Cl or P–P-bonds, respectively. The extent of this bond lengthening is in the P-phosphanyl-substituted species similar and in the P-chloro-derivatives less pronounced than in corresponding CC-unsaturated 1,3,2-diazaphospholenes. Structure correlation involving comparison of exocyclic P–X and endocycl…

Reactivity of Distibanes toward Trialkylalanes and -gallanes:  Syntheses and X-ray Structures of Bisadducts and Heterocycles

2001

Reactions between distibanes of the type Sb2R4 and trialkylalanes and -gallanes R‘3M in 1:2 stoichiometry yield eight bisadducts of the type [Sb2R4][MR‘3]2 (R = Me, R‘ = t-Bu, M = Al 1, Ga 2; R = Et, M = Al, R‘ = Me 3, Et 4, t-Bu 5; M = Ga, R‘ = Me 6, Et 7, t-Bu 8), which were characterized by multinuclear NMR studies and elemental analysis. In addition, 1, 2, 5, and 8 are the first structurally characterized neutral main group Lewis acid−distibane bisadducts. 1−8 are unstable in solution toward the formation of heterocycles of the type [R2SbMR‘2]x. [Me2SbGa(t-Bu)2]3 (9) and [Et2SbGa(t-Bu)2]2 (10) have been isolated and their solid state structures determined by single-crystal X-ray diffrac…

Electron‐Sponge Behavior, Reactivity and Electronic Structures of Cobalt‐Centered Cubic Co 9 Te 6 (CO) 8 Clusters (Eur. J. Inorg. Chem. 12/2008)

2008

The cover picture shows an organometallic electron sponge and an elephant-ear sponge in the background (photo by F. and J. Burek, National Marine Sanctuaries). The electronic flexibility of the cobalt-centered cubic [Co9Te6(CO)8]n cluster ([3]n) in the central circle is expressed by differently charged states (n = 1+ to 5–). Starting from the upper left corner of our graphic in a clockwise direction, neutral [Co9Te6(CO)4(PPh3)4], structurally diverse networks of [Ph3PNPPh3][3] and [Ph3PNPPh3]2[3] salts and the core of the [Co9Te3{ν5-Cp′2Nb(CO)Te}3(CO)8] cluster as a pseudo-protonated representative of the [3]3– anion are shown. Details of the structural, electrochemical and theoretical prop…

Synthesis, Characterisation and Reactivity towards PdII and PtII of ortho-, meta- and para-Xylyl-Based Phosphorus-Containing Macrocycles

2002

The new meta- and para-xylyl-based phosphadithiamacrocycles 6-phenyl-6-phospha-3,9-dithiabicyclo[9,3,1]pentadeca-1(15),12,14-triene (L2) and 6-phenyl-6-phospha-3,9-dithiabicyclo[9,2,2]pentadeca-1(13),12,14-triene (L3) have been synthesised and characterised. The reactivity of these ligands and the previously described ortho-xylyl macrocycle 6-phenyl-6-phospha-3,9-dithiabicyclo[9,4,0]pentadeca-1(11), 12,14-triene (L1) with [PdCl2(cod)] and K2[PtCl4] has been studied. [MCl2(L)] complexes have been obtained and characterised by NMR spectroscopy. X-ray structural analyses have been carried out in the case of [PdCl2L2]·CH3CN (2·CH3CN) and [PdCl2L3] (3). In both compounds the PdII ion adopts a sl…