A [4+2] Condensation Strategy to Imine-Linked Single-Crystalline Zeolite-Like Zinc Phosphate Frameworks
作者:Ritambhara Jangir、Alok Ch. Kalita、Dhananjayan Kaleeswaran、Sandeep K. Gupta、Ramaswamy Murugavel
DOI:10.1002/chem.201800149
日期:2018.4.20
reaction of 1 b with L5 leads to the isolation of a 2D‐boxed‐sheet coordination polymer [Zn4(dipp)4(L5)2]n (7). Selective formation of 3D‐framework 5′ from L3 and the 2D‐framework 7 from L5 is due to the angles created by the coordination of para‐ and meta‐pyridyl nitrogen centers at the zinc centers of the D4R cubane. Compound 5′ has been utilized as a catalyst for Knoevenagel condensation.
具有四个甲酰基的双4环磷酸锌(D4R),[Zn(dipp)(4-Py-CHO)] 4(2)(dipp = diiminopyridine)已被用作构建(SBU)的结构单元一类新的与亚胺连接的[4 + 2] COF样多晶磷酸锌骨架的合成。的反应2与[Zn组成的系列的多晶框架的形成线性的芳族二胺的结果4(DIPP)4(大号)2 ] Ñ(3 - 6()大号=大号1至大号4,是由4-吡啶甲醛与二胺缩合形成的二亚胺。采用另一种合成策略,即2与预先合成的4,4'-双吡啶基双亚胺(L 3),[Zn 4(dip)4(L 3)2 ] n(5')的扩散控制的慢反应。已获得为单晶。复杂物5'是3D框架,具有罕见的八重互穿菱形网络。较长的垫片长度(19.6Å)导致5'处的缠结。粉末衍射数据表明,这些化合物是同网状3D框架。为了研究吡啶基供体相对于中央联苯胺部分的相对位置的影响,研究了3,3'-双吡啶基联苯胺(L 5)作为间隔基。1