作者:Toshihiro Tanaka、Ken Endo、Yasuhiro Aoyama
DOI:10.1246/bcsj.74.907
日期:2001.5
The Ni(II) complex of monoresorcinol derivative of a sterically unhindered tetraalkylporphyrin (3) affords adducts 3•(methanol) and 3•1.5(acetophenone). In the crystals, porphyrin 3 forms hydrogen-bonded (O–H···O–H) polyresorcinol chains with the porphyrin residues sticking out of the chains. The chains are self-assembled in such a manner as to give closely stacked interchain porphyrin columns, while the guest molecules are either firmly bound to the hydrogen-bonding sites (in the case of methanol) or incorporated in the channels running in parallel with the porphyrin stacks (in the case of acetophenone). The formation of such a stacked porphyrin array is not observed when the guest is changed to 4-heptanone or when the porphyrin is changed to a sterically hindered one 4 or 5 with full substitution at the meso- or the β-positions. The mode of interchain porphyrin stacking is discussed in light of the crystal structures of adducts 3•(4-heptanone), 4•pyridine, and 5•(2-nonanone).
空间阻碍小的四烷基卟啉(3)的单间苯二酚衍生物的Ni(II)配合物生成加合物3·(甲醇)和3·1.5(苯乙酮)。在晶体中,卟啉3通过氢键(O-H…O-H)与卟啉残基形成多间苯二酚链,这些残基突出于链外。这些链自我组装,形成紧密堆积的卟啉柱,同时客体分子要么紧缚于氢键位点(甲醇的情况下),要么内嵌于与卟啉堆平行延伸的通道中(苯乙酮的情况下)。当客体变为庚-4-酮或卟啉变为在次甲基或β位完全取代的空间阻碍大的4或5时,未观察到这种堆积的卟啉阵列的形成。基于加合物3·(4-庚酮)、4·吡啶和5·(2-壬酮)的晶体结构,讨论了卟啉间堆积的模式。