Strontium complexes

Strontium, aquatetrakis(diacetamide)-structure, 1,98 Strontium, heptaaqua-dodecaiodide structure, 1, 72 Strontium, octaaqua-structure, 1, 84 Strontium alkoxides synthesis, 2,336 Strontium complexes porphyrins, 2, 820 pyridine oxide, 3, 9 Structure... 

Treatment of the amine 173 (LBu H) in a 2 1 ratio with M[N(SiMe3)2]2(THF)2 (M = Ca, Sr, Ba) in toluene at ambient temperatures affords ( 5-LBut)2M 174 in >93% yields.395 All three compounds possess bent-sandwich structures with -coordinated /3-diketiminato ligands. Similar treatment of the Pr analog of 173 (i.e., LPr H) yields the corresponding calcium and strontium complexes (r 2-LPr )2Ca 175 and (r/s-LPr )2Sr, respectively, in high yield. The reaction of Ba[N(SiMe3)2]2(THF)2 with LPr H yield the -symmetric dinuclear complex 176 (Figure 90). The... 

Strontium Strontium complexed with l-phenyl-3-methyl-4-benzoyl- 5-pyrazone AAS 0.007 ng/1 [909]... 

The case of Srcl8C6(PFO)2 complexes differs, as the PFO" counterions are amphiphilic in nature and their carboxylate head coordinates to strontium, while their perfluoroalkyl chain cannot and do not attract each other, thus preventing selfaggregation of the complexes. The affinity of these fluorinated chains for C02 contributes to solubilize the strontium complexes. As a result, the Srcl8C6(PFO)2 complexes sitting at the interface are "diluted", while the others migrated from the interface to SC-C02 40 % are found at more than 8 A from the interface, and can thus be considered as "extracted" at 305 K. 

Solvation of two Forms of the Strontium Complex Srcl8C62+ (no Counterion) and Srd8C6(N03)2 with bidentate Counterions... 

The 18C6 Molecules and their Strontium Complexes at the Ionic Liquid / Water Interface... 

The interface itself is dynamics, non-planar and ill-defined, due to important local solvent mixing, and the position of the complexes with respect to the interface fluctuates much more than at classical aqueous interfaces. There is thus likely an equilibrium involving two types of positions for the strontium complex at the interface, which is consistent with cation exchange, as well as anion co-extraction mechanisms. 

Purdy efa/. reported the synthesis of the calcium, barium, and strontium complexes of hexafluoroacetylacetone (Hhfac) (4) and trifluoroacetylacetone (Htfac) (5). CVD experiments were performed with the group 2 hfac complexes, and with Ca(tfac)2 to give metal fluoride films, while Ba(hfac)2 has been used to prepare films of YBa2Cu307 s. As with the tmhd derivative, the tfac and hfac barium complexes decompose at, or slightly above, their sublimation temperatures, resulting in significant premature thermolysis of the precursors during deposition. 

If the pH is raised further, the reagent is extracted largely into the aqueous layer, thus lowering the distribution ratio of the complex. On the other hand, if the pH is lowered, the strontium complex in the aqueous phase is weakened by competition from hydrogen ions. The conditions for quantitative extraction are therefore unusually critical. 

Reaction of the sterically encumbered silylselanol HSeSi(SiMe3)3 with either Bu2Mg or the bis(trimethylsilyl)amides of Ca, Sr, and Ba in the presence of Lewis bases yields crystalline alkaline-earth selenolates. The Mg selenolate has been crystallized as a tris((dimethylphosphino)-methyl)-t-butylsilane complex, whereas the Ca, Sr, and Ba complexes have been isolated as TMEDA adducts. The magnesium complex is constructed around a six-membered P—Mg— P— C—S—C-ring that is puckered in a chair conformation. The strontium complex has Sr— Se = 2.94A with a linear Se—Sr—Se core. ... 

A series of 1,2-diarylethane-l,2-diamines and/or their metal complexes are effective conjugate addition catalysts involving stabilized donors. In reaction of enamides with alky-lidenemalonic esters a Cu(II) complex of 119 is employed, whereas the strontium complex of the bis(sulfonamide) 120 mediates the addition of malonic esters to enones. ... 

---