明良 童;保辉 叶;继文 蔡;小明 陈;Seik Weng Ng
Sun Yat-Sen University;University of Malaya
发表时间:1998
期 刊:Inorganic Chemistry
语 言:English
U R L: http://www.scopus.com/inward/record.url?scp=0000143561&partnerID=8YFLogxK
In the presence of guest 2,4′-bpy molecules or under acidic conditions, three compounds, [Cd(4,4′-bpy)2(H2O)2]- (ClO4)2·(2,4′-bpy)2·(H 2O (1), [Zn(4,4′-bpy)2(H2O)2](ClO 4)2·(2,4′-bpy)2·H 2O (2), and [Cu(4,4′-bpy)2(H2O)2](ClO 4)4·(4,4′- H2bpy) (3), were obtained from the reactions of the metal salts and 4,4′-bpy in an EtOH-H2O mixture. 1 has a 2-D square-grid network structure, crystallizing in the monoclinic space group P2/n, with a = 13.231(3) Å, b = 11.669(2) Å, c = 15.019(3) Å, β= 112.82(3)°, Z = 2; 2 is isomorphous with 1, crystallizing in the monoclinic space group P2/n, with a = 13.150(3) Å, b = 11.368(2) Å, c = 14.745(3) Å, β = 110.60(3)°, Z = 2. The square grids superpose on each other into a channel structure, in which each layer consists of two pairs of shared edges, perfectly square-planar with an MII ion and a 4,4′-bpy at each corner and side, respectively. The square cavity has dimensions of 11.669(2) × 11.788(2) and 11.368(2) × 11.488(2) Åfor 1 and 2, respectively. Every two guest 2,4′-bpy molecules are clathrated in each hydrophobic host cavity and are further stabilized by π-π stacking and hydrogen bonding interactions. The NMR spectra clearly confirm that both 1 and 2 contain 4,4′-bpy and 2,4′-bpy molecules in a 1:1 ratio, which have stacking interaction with each other in the solution. 3 crystallizes in the orthorhombic space group Ibam, with a = 11.1283(5) Å, b = 15.5927(8) Å, c = 22.3178(11) Å, Z = 4. 3 is made up of two-dimensional square [Cu4(4,4′-bpy)4] grids, where the square cavity has dimensions of 11.13 × 11.16 Å. Each [4,4′-H2bpy]2+ cation is clathrated in a square cavity and stacks with one pair of opposite edges of the host square cavity in an offset fashion with the face-to-face distance of ca. 3.95 Å. Within each cavity, the [4,4′-H2bpy]2+ cation forms twin three-center hydrogen bonds with two pairs of ClO4- anions. The results suggest that, the guest 2,4′-bpy molecules and protonated [4,4′-H2bpy]2+ cations present in the reaction systems serve as structure-directing templates in the formation of the crystal structures and exclude self-inclusion of the networks having larger square cavities.
Scopus度量
年份 | CiteScore | SJR | SNIP |
---|---|---|---|
1996 | |||
1997 | |||
1998 | |||
1999 | 1.68 | 1.361 | |
2000 | 1.688 | 1.366 | |
2001 | 1.774 | 1.427 | |
2002 | 1.631 | 1.339 | |
2003 | 1.548 | 1.454 | |
2004 | 1.693 | 1.353 | |
2005 | 2.049 | 1.429 | |
2006 | 1.862 | 1.52 | |
2007 | 2.165 | 1.567 | |
2008 | 2.097 | 1.485 | |
2009 | 2.014 | 1.528 | |
2010 | 2.006 | 1.31 | |
2011 | 7.6 | 1.921 | 1.317 |
2012 | 7.8 | 2.094 | 1.331 |
2013 | 7.9 | 1.821 | 1.366 |
2014 | 8.2 | 1.867 | 1.296 |
2015 | 8.5 | 1.782 | 1.23 |
2016 | 8.4 | 1.804 | 1.204 |
2017 | 8.1 | 1.892 | 1.121 |
2018 | 7.8 | 1.501 | 1.099 |
2019 | 7.9 | 1.349 | 1.164 |
2020 | 8 | 1.348 | 1.113 |
2021 | 7.3 |
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