Pyridyl functionalized molecular diketonates (bis-[3-(4-pyridyl)-2,4-pentanedione]beryllium, BeL21,; bis-[3-(4-pyridylethylene)-2,4-pentanedione]beryllium, BeL22; bis-[1-(4-pyridyl)-1, 3-butanedione] beryllium, BeL23) were employed for modular construction of Cd(Zn)/Be alternating coordination polymers. X-ray structure analyses revealed a structural diversity of the heterobimetallic compounds, such as H-bonded molecular complex [Cd{BeL21}(2)Cl-2] center dot H2O; coordination/hydrogen bonded double-chain polymer [Cd{BeL21} (MeOH)(NO3)(2)]center dot CHCl3 center dot 0.5MeOH; 2D structure of the linear [Cd{BeL21}](infinity) chains connected by NCS- bridges; interpenetration of 3D octahedral frameworks formed by hydrogen bonding between linear [M(H2O)(4){BeL21}](infinity) chains and ClO4- counteranions in [M(H2O)(4){BcL(2)(1)}](ClO4)(2)(M=Zn, Cd); interpenetrated bilayer polymer [Cd-2{BeL32}(3)(MeOH)(NO3)(3)](NO3)center dot 4.5MeOH also involving nitrate bridges; 1D chain of heterobimetallic squares housing guest molecules [Cd{BeL32}(2)I-2 center dot 2CHCl(3). (C) 2005 Elsevier Ltd. All rights reserved.
取代的乙酰丙酮3- [2-(吡啶-4-基)乙基]戊烷-2,4-二酮,C 12 H 15 NO 2,(1),在乙酰丙酮部分和杂芳环之间有一个乙烯桥,代表了一种混合金属配位聚合物的引人注目的接头。在晶体中,(1)相对于中心亚乙基和几乎共平面的乙酰丙酮和吡啶基的CC键具有反平面构型。该对位分子以烯醇互变异构体形式存在,在短分子内氢键中具有质子紊乱。2.5 K的单晶中子衍射表明位点占有率为0.602(17)和0.398(17)。乙酰丙酮部分的几何结构与桥连氢的这种位置偏好相一致:与优选的H原子位点相关的O原子的对位时间越长[1.305(2)Å],而类似羰基的O原子越短[1.288(2)Å] C-O键。根据替代氢原子位点的结构因子计算,在第二次中子数据收集中(170 K)确定并测量了对质子分布特别敏感的反射。在此温度下,使用546个独立的中子强度来细化位置和各向同性位移结构模型的参数,其中C和O原子