The second-generation poly(ethylene imine) dendrimer (L), based on ammonia as the initiating core molecule, forms anion and ion-pair complexes in aqueous solution. Speciation of the complex species formed and determination of the relevant stability constants were performed by means of potentiometric titration in a 0.10 M NMe4Cl solution at 298.1 K. Protonated forms of L interact with NO3(-), SO...

In this paper, we introduce a new method to compute magnitude homology of general graphs. To each direct sum component chain complexes, assign pair simplicial complexes whose complex is isomorphic it. First states our main theorem specialized trees, which gives another proof for the known fact that trees are diagonal. After that, consider graphs, may have cycles. We also demonstrate some comput...

The effect of contact ion pairs and comparison the three halide ions on electrophilic C-H activation during base-free synthesis Ru(III)-NHC complexes [RuIII(PyNHCR)(Cl)3(H2O)] (1a; R = Me, 1b; iPr) have been investigated. DFT modelling two pathways for formation complexes, viz. coordination pathway ion-pair pathway, reveals generation carbene. path is preferred azolium salts with Cl− I−, wherea...

Let R be a commutative local ring. We study the subcategory of the homotopy category of R-complexes consisting of the totally acyclic Rcomplexes. In particular, in the context where Q → R is a surjective local ring homomorphism such that R has finite projective dimension over Q, we define an adjoint pair of functors between the homotopy category of totally acyclic R-complexes and that of Q-comp...

Proton magnetic resonance was used to study the interactions between nucleosides and phosphate monoanion in dimethyl sulfoxide. Ribose was able to form two mutually exclusive 1:1 complexes involving either OH3' and OH5' or OH3' and OH2' as hydrogen bond donor groups. Deoxyribose could form only one of these complexes. A specific interaction of phosphate with the base moiety of nucleosides was o...

Complex formation and intermolecular excited-state proton transfer (ESPT) between a dihydroxy-1,8-naphthalimide photoacid and organic bases are investigated in polar aprotic solvents. First, quantum chemical calculations are used to explore the acid-base and spectroscopic properties and to identify energetically favorable complexes. The two hydroxyl groups of the photoacid enable stepwise forma...

A series of beta-diketiminate lead halide complexes has been synthesised LPbCl (2), LPbBr (3) and LPbI (4) (L = {N(2,6-(i)Pr(2)C(6)H(3))C(Me)}2CH]), which includes a rare example of a three-coordinate lead iodide (4). The chloride and bromide complexes, 2 and 3, are relatively stable in both the solid and solution states, only slowly decomposing to elemental lead over the course of a month in s...