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Volumn 304, Issue 5675, 2004, Pages 1308-1312

Molecular Borromean rings

Author keywords

[No Author keywords available]

Indexed keywords

APPROXIMATION THEORY; CHEMICAL BONDS; NANOSTRUCTURED MATERIALS; NUCLEATION; SELF ASSEMBLY;

EID: 2542610859     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1096914     Document Type: Article
Times cited : (701)

References (42)
  • 16
    • 2542587491 scopus 로고    scopus 로고
    • note
    • To our knowledge, the only known case of molecular BRs consists of single-stranded DNA derived by ligating a right-handed B-DNA three-arm junction and a left-handed Z-DNA three-arm junction. The molecule is comprised of three individual rings of 196, 206, and 216 nucleosides in which each arm of the junctions contains 1.5 turns of DNA, see (38).
  • 17
    • 2542555552 scopus 로고    scopus 로고
    • note
    • For a metallic microstructure possessing the BR topology, see (39).
  • 18
    • 2542585885 scopus 로고    scopus 로고
    • note
    • Examples of Borromean links within 2D and 3D arrays have been identified retroactively in certain coordination polymers, see (40).
  • 19
    • 2542640593 scopus 로고    scopus 로고
    • note
    • For examples of hexanuclear cage complexes with topological structures reminiscent of BRs, see (41).
  • 32
    • 2542613435 scopus 로고    scopus 로고
    • note
    • A neutral BR surrogate was constructed within the input mode of Macromodel 4.0 by aligning orthogorally the three identical [2+2] macrocycles in initially planar conformations. Six generic atoms (Z type) were placed between each set of exo-bipyridyl and endo-diiminopyridyl coordination sites and then subjected to energy minimization in the absence of counterions by using the Polak-Ribière Conjugate Gradient (PRCG) method and the AMBER* forcefield.
  • 33
    • 2542604291 scopus 로고    scopus 로고
    • note
    • κα radiation using the ω-scan mode. Data were corrected for absorption with the SADABS program, and structure solution and refinement were performed with the SHELX-97 software package. All nonhydrogen atoms and nonguest molecules were refined anisotropicatty, whereas the hydrogen atoms were included at geometrically calculated positions and allowed to ride on their parent atoms. Details of the x-ray structure determination are available from the Cambridge Crystallographic Data Centre (CCDC), deposition number CCDC 231701. This data can be obtained free of charge from www.ccdc.cam.ac.uk/conts/retrieving.html or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax, (+44)1223-336-033, e-mail, deposit@ccdc. cam.ac.uk.
  • 34
    • 2542511277 scopus 로고    scopus 로고
    • note
    • The cuboctohedron's volume was calculated by mapping out the 3D space of the largest sphere that can be placed inside the cavity with its centroid and wall boundary defined by the Cartesian coordinates of 12 O atoms allowing for their van der Waals radii. The calculations were performed using MCAVITY, a program that is freely available at www.x-seed.net/cavity.html.
  • 42
    • 2542640592 scopus 로고    scopus 로고
    • note
    • Supported by an NSF grant (CHE0317170) and two equipment grants (CHE9974928 and CHE0092036), also from the NSF. Dedicated to the memory of Norma Stoddart, who helped in the editing of the manuscript before she died on 12 January 2004.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.