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Modified methods to synthesize of 1,8-bis[2-(diphenylphosphoryl)phenoxy]-3,6-dioxaoctane (L). Crystal structure and vibration spectra of [LiL]ClO4·2C6H6

“…A different alteration of frequencies was observed for complexes of lithium with podand L 1 [12]: the ν(Р=О) was increased by 5-7 cm -1 and the position of the ν (Рh-О) band remained unchanged. The low-frequency region of the spectrum includes the vibrations that depend on the conformation of the ethylene glycol units {1090-1120 cm -1 [ν as (СОС)], 1000-800 cm -1 [ν(СО), ρ(СН 2 ), ν(СС)]} or on the mutual orientation of the benzene rings {800-700 cm -1 [δ(Ph)], ~500 cm -1 , [δ(PhРО), δ(СРО)]} [12]. This range of the IR spectrum of podand L contains two bands: : the intense band near 1120 cm -1 due to vibrations of the benzene rings connected with the phosphorus atom and the medium-intensity band near 1102 cm -1 due to the ν as (СОС) vibrations.…”

“…Taking into account that in the structure the Cl 1 O 4 -anion can adopt two orientations, it is impossible to describe the crystal topology unambiguously. In the case that the anion retains its orientation in a layer, perpendicular to the z axis, the С-Н···О hydrogen bonds between cations [LiL] + and anions Cl 1 O 4 -form chains running (depending on the anion orientation) along the x or y axis ( (Table 2) was done based on the structural and spectral investigations [10][11][12].…”

Preparation and crystal structure of a 1:4 diaqua(benzo-15-crown-5)(perchlorato-O)calcium perchlorate and diaqua(4′-nitrobenzo-15-crown-5)(perchlorato-O)calcium perchlorate solid solution

“…bonds with gauche torsion angles (of the same sign) relative to them (O 4 3C 5 , C 5 3C 6 and C 8 3C 9 , C 9 3O 10 ) coming together to both C 5 and C 9 atoms. Note that crystal structures have previously been reported for only two 4`-nitrobenzo-15-crown-5 complexes (potassium and sodium) [9,10] and both had a two-angular conformation of the 15-membered macroring. In the case of such a two-angular conformation, the macroring in hand characteristically has a roughly approximate symmetry plane that passes through O 7 and the middle point of the C 14 3C 15 bond perpendicularly to the mean plane of the macroring.…”

Reaction of rhodium trichloride and dirhodium(II) acetate with trans-4,4′-bis(diethoxyphosphoryl)biphenyl-18-crown-6

“…In the IR spectrum of ligand L these bands appear in the same region as those of ethylene glycol units in the form of a strong multiplet band: ν(P=O) ~1240 cm -1 , ν s (Ar-OC) ~1264 cm -1 , τ(CH 2 ) ~1246 cm -1 , and ν as (Ar-OC) ~1220 cm -1 [23][24][25]27]. In the IR spectrum of product III these vibrations appear as a doublet band with a more intense high-frequency component at ~1264 cm -1 and less intense low-frequency component at ~1224 cm -1 .…”

“…Therefore, changes of the bands of the conformation-sensitive vibrations ν as (COC) are due to the conformational rearrangement of the polyethylene glycol chains of the ligand at the complexation and are an indication of the complex formation. The main analytical bands in the IR spectrum of the ligand L are the absorption bands associated with vibrations of the phosphoryl group and its surrounding [10,[22][23][24][25], as well as the absorption band of ethylene glycol groups of the crown ether ring [26][27][28]. The shift of the vibration frequency of ethylene glycol group of crown ethers in the IR spectra is known to indicate the formation of a complex [26,29].…”