Rubidium complex

Crown-6, methylammonium complex equilibrium constant, 7, 744 (80TL1323) [18]Crown-6, rubidium complex X-ray. 7, 734 (74AX(B)3744)... 

Roseocobalt — see Cobalt, aquapentaammine-Roseopentaammine —see Aquapentaammine Roussin s black, 4, 1191 Roussin s red, 4, 1191 Roussin s salts, 4,240, 1243 Rubber vulcanization zinc complexes in, 5, 998 Rubeanic acid — see Dithiooxamid Rubidium complexes... 

Note added in proof Tetranactin and its sodium, potassium, and rubidium complexes have been the subject of crystal structure analysis. (Iitaka, Y., Sakamaki,... 

Subsequent alkylation of 21a-c with iodomethane and potassium f-butoxide as a base in THF affords 22a-c as the potassium complexes in 81-95% yield. Use of rubidium f-butoxide24 under the same conditions gives the corresponding rubidium complexes. Alkylation of 21a with iodoethane gives 22d... 

FIGURE 17.19. Stereoviews of (a) dibenzo-18-crown-6 (Refs. 80 and 84), and (b) its rubidium complex (Ref. 80). Hydrogen atoms are omitted for clarity. 

FIGURE 17.19 (cont d), (c) Another view of the rubidium complex of dibenzo-18-crown-6 (Ref 80). (d) The chemical formula of this complexing agent. 

The procedure given for the preparation of Cs[Co(edta)] -2H20 is followed, except that 0.281 g (0.005 mole) of potassium hydroxide is substituted for the cesium hydroxide. The filtration step for this complex is slow (35 minutes), in comparison with the cesium and rubidium complexes. 

A dry mixture of analytical reagent grade cobalt(ll) carbonate (0.595 g, 0.005 mole) and previously recrystallized H4pdta (1.53 g, 0.005 mole) are placed into a 50-mL Erlenmeyer flask, and 6.0 mL of deionized H20 is added. The mixture is then treated exactly as the cdta complex in Section A-l. Anal. Calcd. for Cs[Co(pdta)]lH20 C, 25.80 H, 3.15 N, 5.47. Found C, 25.90 H, 3.44 N, 5.40. The potassium and rubidium complexes are synthesized in a similar manner, except that potassium hydroxide (0.281 g, 0.005 mole) and rubidium hydroxide (0.512 g, 0.005 mole) are substituted for cesium hydroxide, respectively. 

The procedure given for the preparation of Cs[Co(pdta)]-lH20 is followed, except that S( + )H4pdta,17 replaces l pdta and only 4.0 mL, instead of 6.0 mL, of water is used in the synthesis. The potassium complex A-( - l -KlCo-(S( + )pdta)HH20, and the rubidium complex A-(-)546-Rb[Co(S( + )pdta)]-1H20 are synthesized in an analogous manner, except that 0.281 g (0.005 mole) of potassium hydroxide and 0.512 g (0.005 mole) of rubidium hydroxide, respectively, are substituted for cesium hydroxide. 

The x-ray crystal structures of the lithium, potassium, and rubidium picrate complexes of torand 1 (f = butyl) were determined.and the structures of the potassium and rubidium complexes are shown in Fig. 5. In ihese two complexes, the metal atoms rest in the center of the cavity of 1, which adopts the staggered pseudo-D3j conformation predicted by molecular modeling. Potassium is clearly an excellent fit to the torand cavity,... 

A l,2-diphenyl-2,5-cyclohexadienyl rubidium complex isolated from the Birch-type reduction of 1,2-diphenylbenzene with mbidium metal in THF has been characterized. " ... 

Figure 10 The rubidium complex of the cryptate (18) (Reproduced from Chem. Comm., 1970, 217)...

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