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首页> 外文期刊>Acta crystallographica. Section F, Structural biology communications >Multiple N-H center dot center dot center dot NC, C-H center dot center dot center dot NC and nitrile center dot center dot center dot pi interactions in 4,4 '-bipyridine-1,1 '-diium bis(1,1,3,3-tetracyano-2-ethoxypropenide): structure determination and DFT calculations of anion center dot center dot center dot pi cation interaction energies
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Multiple N-H center dot center dot center dot NC, C-H center dot center dot center dot NC and nitrile center dot center dot center dot pi interactions in 4,4 '-bipyridine-1,1 '-diium bis(1,1,3,3-tetracyano-2-ethoxypropenide): structure determination and DFT calculations of anion center dot center dot center dot pi cation interaction energies

机译:多个N-H中心点中心点DOT DOT NC,C-H中心中心点中心DOT DOT NC和氮气中心中心中心点中心DOT中心点DOT PI相互作用4,4'-4'-Bipyridine-1,1'-Diium bis(1,1,1,3,1,1,3, 3-四酰基-2-乙氧基丙酰胺):阴离子中心中心点中心点点相互作用能量的结构测定和DFT计算

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摘要

Polynitrile anions are important in both coordination chemistry and molecular materials chemistry, and are interesting for their extensive electronic delocalization. The title compound crystallizes with two symmetry-independent half 4,4'-bipyridine-1,1'-diium (bpyH(2)(2+)) cations and two symmetry-independent 1,1,3,3-tetracyano-2-ethoxypropenide (tcnoet(-)) anions in the asymmetric unit. One of the bpyH(2)(2+) ions is located on a crystallographic twofold rotation axis (canted pyridine rings) and the other is located on a crystallographic inversion center (coplanar pyridine rings). The ethyl group of one of the tcnoet(-) anions is disordered over two sites with equal populations. The extended structure exhibits two separate N-H center dot center dot center dot NC hydrogen-bonding motifs, which result in a sheet structure parallel to (010), and weak C-H center dot center dot center dot NC hydrogen bonds form joined rings. Two types of multicenter CN center dot center dot center dot pi interactions are observed between the bpyH(2)(2+) rings and tcnoet(-) anions. An additonal CN center dot center dot center dot pi interaction between adjacent tcnoet(-) anions is observed. Using density functional theory, the calculated attractive energy between cation and anion pairs in the tcnoet(-)center dot center dot center dot pi (bipyridinediium) interactions were found to be 557 and 612 kJ mol(-1) for coplanar and canted bpyH(2)(2+) cations, respectively.
机译:多硝基阴离子在配位化学和分子材料化学方面都很重要,并且对于它们的广泛电子离域化而言很有趣。标题复合与两个独立于对称的半4,4'Bipyridine-1,1'-diium(bpyh(2)(2)(2+))阳离子和两个独立于对称性无关的1,1,3,3-Tetracyano-2 - 非对称单元中的乙氧基丙二烯(TCNOET( - ))阴离子。 BPYH(2)(2+)离子之一位于晶体学的双重旋转轴(倾斜吡啶环)上,另一个位于晶体倒置中心(共浮标吡啶环)上。 TCNOET( - )阴离子之一的乙基基团在两个相等人群的位点上是无序的。扩展的结构展示了两个独立的N-H中心点中心点DOT中心点NC氢键基序,从而导致平行于(010)的板结构,而弱C-H中心点中心点DOT中心DOT中心点NC氢键形成了join od Coin Con Con Coned Rings。在BPYH(2)(2+)环和TCNOET( - )阴离子之间观察到两种类型的多中心CN中心点DOT中心点DOT中心点DOT PI相互作用。观察到相邻TCNOET( - )阴离子之间的附加CN中心点中心点DOT中心点PI相互作用。使用密度函数理论,发现Coclanar和Canted BPYH(tCNOET( - )中心点中心点中心点PI(Bipyridinediium)相互作用计算出的有吸引力的能量( - )中心点中心点中心点PI(Bipyridinediium)相互作用为557和612 kJ mol(-1)(-1)(-1)(-1)(-1) 2)(2+)阳离子。

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