Structural transformations of Pb(II)- trans -1,2-bis(4′-pyridyl) ethene coordination polymers in solution

Peedikakkal A.M.P.; Vittal J.J.

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Structural transformations of Pb(II)- trans -1,2-bis(4′-pyridyl) ethene coordination polymers in solution

机译：溶液中Pb（II）-反式-1,2-双（4'-吡啶基）乙烯配位聚合物的结构转变

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Reaction of bpe (bpe = trans-1,2-bis(4′-pyridyl)ethylene) with Pb(OAc)_2?3H_2O in the presence of trifluoroacetic acid (HTFA) affords a triple-stranded coordination polymer (CP) [Pb _3(μ-bpe)_3(μ-O_2CCF_3) _2(μ-O_2CCH_3)_2(O _2CCF_3)_2] (1) in two days, which undergoes structural transformation in solution to yield a two-dimensional (2D) sheet-like CP [Pb(μ-bpe)(μ-O_2CCH_3)(O_2CCF _3)]?0.25bpe?1.75H_2O (2) in three weeks; finally compound 2 rearranges to [Pb(μ-bpe)(O_2CCH_3)(O _2CCF_3)] (3) in the fourth week. Compound 3 has a molecular fabric-like interwoven structure formed by spiral one-dimensional (1D) coordination polymeric chains. Reaction of bpe with Pb(O_2CCF _3)_2 and Pb(OAc)_2?3H_2O respectively in equimolar ratio produces [Pb(μ-bpe)(μ-O _2CCF_3)_2] (4) and [Pb(μ-bpe)(O _2CCH_3)_2]?0.25H_2O (5). The compound 4 is a three-dimensional (3D) CP with a 4~2.6 ~3.8-sra (SrAl_2) topology, whereas 5 has a double-stranded structure with Pb(II)???π (pyridyl) interactions between 1D chains. The compounds [Pb(μ-bpe)(μ-O_2CCH_3)(O _2CCF_3)]?0.25bpe (2a), 4, and 5 have been characterized by X-ray crystallography, while 1 and 3 were reported before. The factors influencing the rearrangement of CPs in solution have been discussed. The structural topological features observed in 2a, 4, and 5 have been attributed to the coordination preference of the Pb(II) and the carboxylate ligands.

机译：在三氟乙酸（HTFA）存在下，bpe（bpe =反式-1,2-双（4'-吡啶基）乙烯）与Pb（OAc）_2？3H_2O的反应提供了三链配位聚合物（CP）[Pb _3（μ-bpe）_3（μ-O_2CCF_3）_2（μ-O_2CCH_3）_2（O _2CCF_3）_2]（1）在两天内进行溶液中的结构转化，以产生二维（2D）片状CP [Pb（μ-bpe）（μ-O_2CCH_3）（O_2CCF _3）]？0.25bpe？1.75H_2O（2）在三周内;最后化合物2在第四周重新排列为[Pb（μ-bpe）（O_2CCH_3）（O _2CCF_3）]（3）。化合物3具有由螺旋一维（1D）配位聚合物链形成的分子织物状交织结构。 bpe与等摩尔比分别与Pb（O_2CCF _3）_2和Pb（OAc）_2？3H_2O反应生成[Pb（μ-bpe）（μ-O_2CCF_3）_2]（4）和[Pb（μ-bpe）（ O _2CCH_3）_2]？0.25H_2O（5）。化合物4是具有4〜2.6〜3.8-sra（SrAl_2）拓扑结构的三维（3D）CP，而化合物5具有一维链之间具有Pb（II）???π（吡啶基）相互作用的双链结构。。化合物[Pb（μ-bpe）（μ-O_2CCH_3）（O _2CCF_3）]≤0.25bpe（2a），4和5已通过X射线晶体学进行了表征，而之前已报道了1和3。讨论了影响溶液中CP重排的因素。在2a，4和5中观察到的结构拓扑特征归因于Pb（II）和羧酸盐配体的配位偏爱。

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《Crystal growth & design》 |2011年第10期|共7页
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Peedikakkal A.M.P.; Vittal J.J.;
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Structural transformations of Pb(II)- trans -1,2-bis(4′-pyridyl) ethene coordination polymers in solution

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