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1993 (1)
1988 (1)
1Author    Gerhard Thiele, Dietmar PutzasRequires cookie*
 Title    Antiprismatische und dodekaedrische Oktaaquokationen von Calcium und Strontium in den Kristallstrukturen von Tetrahalogenocadmaten und -mercuraten Antiprismatic and Dodecahedral Oktaaquo Cations of Calcium and Strontium in the Crystal Structures of Tetrahalogeno Cadmates and Mercurates  
 Abstract    The tetrahalogenometallates CaHgBr 4 -8H 2 0, CaCdI 4 -8H 2 0 and SrCdI 4 -8H 2 0 which have been obtained by crystallization from aqueous solutions form different structures. The orthorhombic compounds CaHgBr 4 -8H^O (Cmca, a — 1720.1(6) pm, b = 1329.2(4) pm. c = 1369.5(7) pm, Z — 8, R -0.041) and SrCdI 4 -8H 2 0 (Pnma, a = 1404.6(2) pm, b = 1841.1(5) pm. c = 1420.6(3) pm, Z = 8, R = 0.037) are built up from dodecahedral [A(H 2 0) 8 ] cations (A = Ca, Sr) and tetrahedral MX 4 anions (M = Hg, Cd) which are cubic closed packed in a CuAu type structure. The tetragonal structure of CaCdI 4 -8H 2 0 (P4/nbm, a = 1268.14(13) pm, c = 536.96(35) pm. Z = 2, R = 0.034) contains antiprismatic [Ca(H 2 0) x ] 2+ cations and tetrahedral Cdl 4 anions, which form together a tetragonal primitive rod package. 
  Reference    Z. Naturforsch. 43b, 1224—1234 (1988); eingegangen am 9. Juni 1988 
  Published    1988 
  Keywords    Crystal Structure, Hydrates, Cadmium Complexes, Mercury Complexes 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1224.pdf 
 Identifier    ZNB-1988-43b-1224 
 Volume    43 
2Author    SeungR. Yong, D. Ieter, W. G. Ruenw EdelRequires cookie*
 Title    Differential Effect of Hg(II) on [d(A)n * d(T)n] and [d(A-T)n * d(A-T)n] Sequences: Circular Dichroism (CD) Measurements and Endonuclease Digestion Studies Using Poly|d(A) * d(T)] and Poly[d(A-T) * d(A-T)] as Substrates  
 Abstract    The long-wavelength positive CD bands o f poly[d(A) • d(T)] and poly[d(A-T)-d(A-T)] be­ come inverted upon the addition of Hg(C104)2. Poly[d(A)-d(T)] requires higher levels of mer­ cury to undergo inversion than poly[d(A-T)-d(A-T)]\ Mercurated poly[d(A) d(T)] is digested more rapidly than the control by DNase I or staphylococcal nuclease at low levels of Hg(C104)2. Let r = [Hg(C104)2]added/[DNA-P]. A 4-to 5-fold rate increase occurs with DNase I at r = 0.25; a 2-fold increase with staphylococcal nuclease at r = 0.2. By contrast, digestion of poly[d(A-T) d(A-T)] decreases immediately with increasing r. The noted rate increases appear to be due to a modification of poly[d(A)-d(T)] helix structure prior to the chiroptical conver­ sion. The modification is interpreted as a widening of the minor groove, permitting, thus, a better binding of DNase I to its substrate. The overall changes in CD as well as enzymatic digestion rates are taken to signal mercury-induced alterations in helix screwness from right-to-left. They are totally reversible subsequent to the removal o f mercury. 
  Reference    Z. Naturforsch. 48c, 488—494 (1993); received September 18 1992/February 2 1993 
  Published    1993 
  Keywords    Circular Dichroism, Endonucleases, Polynucleotides, Mercury Complexes, Right«-*Left Inversions 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0488.pdf 
 Identifier    ZNC-1993-48c-0488 
 Volume    48