Reorientation of ions in contact ion pairs as a factor increasing the intensity of outer-sphere charge transfer bands

Tolstykh, MV; Birin, KP ; Nelyubina, YV ; Kotov, VY MENDELEEV COMMUNICATIONS

2014, Volume: 24 , Issue: 1 , Pages: 47-49

Impact Factor 1.154 1.049 2013 5 year

AbstractThe found increase in the extinction coefficients of ion pairs at the low dielectric permittivity of solutions in binary solvents depends on the nature of a nonpolar solvent, and it is related to not only the transformation of solvate-separated ion pairs into contact ones but also the reorientation of ions in the contact ion pairs

Bis{bis-[1-meth-oxy-2-(2-meth-oxy-eth-oxy)ethane-kappa(3) O,O',O'']sodium} 1,1,2,2-tetra-phenyl-ethane-1,2-diide.

Minyaev, ME; Ellis, JE Acta crystallographica. Section E, Structure reports online

2014, Volume:70, Issue:Pt 7, Pages:m249-50

AbstractCrystals of the title salt, [Na(C6H14O3)2]2(C26H20), were grown from a tetra-hydro-

furan/diglyme/Et2O solvent mixture [diglyme is 1-meth-oxy-2-(2-meth-oxy-eth-oxy)ethane]. The cations and dianion are separated in the crystal structure, unlike in the other three structurally characterized dialkali metal tetra-phenyl-ethyl-ene salts.

The asymmetric unit contains one [Na(diglyme)2](+) cation and one half of the [Ph2CCPh2](2-) dianion. The latter lies on a twofold rotation axis. C-C bond-length

redistribution displays that excessive electron density of the dianion is predominantly located at the C atoms of a former double bond and at all eight ortho positions. The

studied crystal was a twin, with the ratio of two major components being 0.2143 (9):0.7857 (9). The twin operation is a twofold rotation around the a axis.

Di- and Triphenylacetates of Lanthanum and Neodymium. Synthesis, Structural Diversity, and Application in Diene Polymerization

Roitershtein, DM ; Vinogradov, AA ; Vinogradov, AA ; Lyssenko, KA ; Nelyubina, YV ; Anan'ev, IV ; Nifant'ev, IE ; Yakovlev, VA ; Kostitsyna, NN

ORGANOMETALLICS 2013, Volume: 32, Issue: 5, Pages: 1272-1286

Impact Factor 4.253 3.817 2013 5 year

AbstractA new family of lanthanide complexes with di- and triphenylacetate ligands was prepared from LnCl(3).

Dimeric diphenylacetates were the only isolated products of the reaction between LnCl(3) (Ln = La, Nd) and Ph2CHCOONa. The exchange reaction between LnCl(3) and Ph3CCOONa led to the formation of three structurally different types of neodymium and lanthanum complexes under different reaction

conditions. Various coordination modes of the carboxylate ligands were revealed, including kappa(2)- and kappa(1)-terminal coordination, mu(2)-kappa(1):kappa(1)-bridging, and mu(2)-kappa(1):kappa(2)-

semibridging. The treatment of La and Nd tris-triphenylacetates with excess AlEt3 produces the dimeric tetraethylaluminates [Ln(2)((mu(2)-kappa(1):kappa(1)-Ph3CCOO)(4)(AlEt4)(2)]. The structures of the key La and Nd triphenylacetates that were obtained from these reactions were verified by X-ray

diffraction, and the complex [(THF)(4)Nd-2(Ph2CHCOO)(2)(mu(2)-kappa(1):kappa(2)-Ph2CHCOO)(2)(mu(2)-kappa(1):kappa(1)-Ph2CHCOO)(2)] was studied by high-resolution X-ray diffraction.

Neodymium di- and triphenylacetate complexes can serve as precursors of catalysts for butadiene and isoprene stereospecific 1,4-cis polymerization.

Strong negative synergism of ion pair extinction coefficients in chloroform-acetone and methylene dichloride-acetone

mixtures Birin, KP ; Dunin, DS ; Tolstykh, MV ; Kotov, VY

MENDELEEV COMMUNICATIONS 2014, Volume: 22, Issue: 6, Pages: 320-322

Impact Factor 1.154 1.049 2013 5 year

AbstractThe heteroselective preferential solvation of the iodides of N-heterocyclic aromatic

cations in acetone-chloroalkane (chloroform and dichloromethane) binary mixtures results in not only a shift in the maxima of outer-sphere charge transfer absorption bands but also a considerable decrease in the molar

extinction coefficients of ion pairs.

Formation of ionic pairs between single-charged anions and double-charged cations with separated charge

Dunin, DS; Kotov, VY ; Kuleshov, VS ; Nelyubina, YV MENDELEEV COMMUNICATIONS

2012, Volume: 22, Issue: 3, Pages: 138-140

Impact Factor 1.154 1.049 2013 5 year

Abstract

The stability constants and extinction coefficients of ethyl viologen-iodide ionic pairs were calculated using the modified Kosover equation, and the effective

cation charge was found by an analysis of the crystal structure of ethyl viologen diiodide.