- Full text PDF available (1)
- This year (0)
- Last 5 years (1)
- Last 10 years (2)
Journals and Conferences
RATIONALE AND OBJECTIVES The purpose of this study was to examine the radiologic attenuation properties of the parent cluster compounds, particularly attenuation as a function of discrete photon energy, before investigating ligand substitutions, which are necessary to improve cluster biocompatibility and to impart desirable physicochemical properties. … (More)
Reduction of TaBr(5) with Ga in the presence of KBr in a sealed borosilicate ampule at 400 degrees, followed by aqueous Soxhlet extraction and addition of stannous bromide and hydrobromic acid to the extract, yielded Ta(6)Br(14).8H(2)O in 80-84% yield. The new procedure provides a convenient, low temperature, high yield route to the synthesis of the title… (More)
Tungsten hexachloride was reduced by Hg or Bi at moderately low temperatures ( approximately 350 degrees C) to afford good yields (Hg, 73%; Bi, 85%) of W(6)Cl(12) after conversion of the reduction product to the chloro acid (H(3)O)(2)[W(6)(&mgr;(3)-Cl)(8)Cl(6)](OH(2))(x)(), recrystallization, and thermolysis in vacuo. Antimony was a less effective reductant… (More)
Base hydrolysis of BiO(ClO4) yields ClO4- salts of the novel nonabismuth polyoxo cation Bi9(mu3-O)8(mu3-OH)6(5+); ethanolysis converts to the ethoxide Bi9(mu3-O)8(mu3-OEt)6(5+).
Reduction of TaCl(5) with either Ga or Ga(2)Cl(4), in the presence of NaCl, in a sealed borosilicate glass ampule at 500 degrees C, followed by aqueous Soxhlet extraction and treatment with SnCl(2) and hydrochloric acid, yielded Ta(6)(mu-Cl)(12)Cl(2)(OH(2))(4).4H(2)O in 92% (Ga) or 96% (Ga(2)Cl(4)) yield. Ga(2)Cl(4), a probable intermediate in the Ga-based… (More)
The novel tetrahedral [Bi(5)(dpd)(6) within CH(3)CN](ClO(4))(3).3CH(3)CN (dpd = di-2-pyridyl-gem-diolate) has been synthesized from [Bi(9)(mu(3)-O)(8)(mu(3)-OH)(6)](ClO(4))(5) and di-2-pyridyl ketone. The Bi(5) complex incorporates CH(3)CN via C-HO hydrogen bonding.
(C5Me5R)2Ta2Cl4 (d2-d2) disproportionates under dinitrogen to [(C5Me4R)TaCl2]2(mu-N2) and the D3h cluster cation (C5Me4R)3Ta3(mu-Cl)6+ with anionic (C5Me4R)TaCl4-.
The synthesis and characterization of polynuclear lanthanide complexes and tungsten chloride clusters are detailed. The relevance of these complexes to MRI contrast agents, physiological parameter reporting MRI contrast agents, and X-ray computed tomography contrast agents is discussed. Polylanthanides, in particular polygadolinium and polyeuropium(II)… (More)
Reduction of the organoditantalum allene complex (eta-C5Me4R)2Ta2(mu-X)X3(mu-eta1,eta3-C3H4) (R = Me (Cp*), Et; X = Cl, Br) with sodium amalgam leads to the propynylidene complex (eta-C5Me4R)2Ta2(mu-H)2X2(mu-HCCCH) by a formal double 1,3-C-H activation of the allene ligand. The solid-state molecular structure contains a planar HCCCH ligand bridging, in… (More)