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Comparisons of 105Rh(III) chloride complexation with [14]aneNS3, [14]aneN2S2 and [14]aneN4 macrocycles in aqueous solution

Comparisons of 105Rh(III) chloride complexation with [14]aneNS3, [14]aneN2S2 and [14]aneN4 macrocycles in aqueous solution. Li, N.; Eberlein, C. M.; Volkert, W. A.; Ochrymowycz, L.; Barnes, C.; Ketring, A. R. (Department Chemistry, University Missouri Research Service, Columbia, MO 65211, USA). Radiochimica Acta, 75(2), 83-95 (English) 1996 Oldenbourg. CODEN: RAACAP. ISSN: 0033-8230. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 8, 28, 75 105Rh(III) complexation was studied with two thiamacrocycle ligands (i.e., [14]aneNS3 and [14]aneN2S2). 105Rh(III) chloride forms a well-defined complex with the [14]aneNS3 macrocycle in high yields (93 ± 3% at pH 4) at low ligand concns. (i.e., ￡5 mmolar) under relatively mild conditions. There are some commonly used reagents like 4403-78-5 in this article. These results indicate the potential utility of using the [14]aneNS3 macrocycle frameworks as a basis to prep. high specific activity 105Rh-bifunctional Chelates. Under the same reaction conditions, 105Rh complexes with [14]aneN2S2 and [14]aneN4 ligands are formed, but in significantly lower yields (80 ± 3 and 54 ± 6% at pH 4, resp.). X-ray crystal structure studies demonstrate the cis Rh(III) dichloro+ core in both the {Rh(III)[14]aneN2S2Cl2}+ and {Rh(III)[14]aneNS3Cl2}+ complexes. .

Synthesis and structural aspects of macrocyclic polyamines containing 2,2'-bipyridinyl units(s)

Synthesis and structural aspects of macrocyclic polyamines containing 2,2'-bipyridinyl units(s). Newkome, George R.; Pappalardo, Sebastiano; Gupta, Vinod K.; Fronczek, Frank R. (Dep. Chem., Louisiana State Univ., Baton Rouge, LA 70803-1804, USA). J. Org. Chem.In this article, certain chemicals are used. Some of their cas registry numbers are 4403-78-5 and 56187-04-3 , 48(25), 4848-51 (English) 1983. CODEN: JOCEAH. ISSN: 0022-3263. DOCUMENT TYPE: Journal CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) Section cross-reference(s): 75 An one-step, general procedure to aza-crown analogs I (m = 0, n = 2, m = n = 1, R = tosyl; m = 2, n = 1, R = MeSO2) (II) contg. 2,2'-bipyridinyl unit(s), by reaction of 6,6'-bis(chloromethyl)-2,2'-bipyridine with oligomers of ethylenediamine tosylate or mesylate di-Na salts in DMF, is described. Detosylation or demesylation of II to give the free macrocyclic polyamines I (n = 1, R = H) was achieved in excellent yield by hydrolysis with concd. H2SO4. A novel synthetic route to sym. multidentate macrocyclic diamines such as the hexaaza-18-crown-6 analog III is also reported. 1H NMR spectra of the 15- to 18-membered macrocycles suggest a syn orientation of bipyridinyl unit(s), whereas the 24-membered 2:2-macrocycle I (n = 0, n = 2, R = tosyl) (IV) is shown by single X-ray diffraction to adopt a stacked conformation, with the bipyridinyl moieties in the anti configuration. Mass spectral aspects of these cyclic amines are also discussed. .