unsymmetrical bis‐pyridyl hydrazone ligand that can act both as a bridging and as a chelating ligand. In all three the lead center is hemidirectionally coordinated and is thus sterically optimal for participation in tetrel bonding. In the crystal structures of all three compounds, the lead atoms participate in short contacts with thiocyanate sulfur or nitrogen atoms. These contacts are shorter than the
三种固体材料,[Pb(HL)(SCN)2 ] · CH 3 OH(1),[Pb(HL)(SCN)2 ](2)和[Pb(L)(SCN)] n(3) ,是从Pb(SCN)2获得的以及一个不对称的双
吡啶ligand
配体,它既可以起到桥连作用,也可以起到螯合作用。在这三个部分中,引线中心在半方向上是协调的,因此在空间上最适合参与
铁线连接。在所有这三种化合物的晶体结构中,
铅原子与
硫氰酸酯的
硫或氮原子短时接触。这些接触是比范德华半径(3.04-3.47埃
铅的总和短⋅⋅⋅ S和3.54埃
铅⋅⋅⋅ N)和互连共价键合单元(单体,二聚体,和2D聚合物)进超分子组装体(链和3D结构)。DFT计算表明这些触点是相当大的能量的tetrel键(6.5-10.5千卡摩尔-1
铅⋅⋅⋅S和16.5 kcal mol -1(对于Pb⋅⋅⋅N)。对C
SD中的结构进行的一项调查表明,具有规则几何形状的Pb II配合物晶体中经常