Syntheses, structures, and magnetic characterizations of cyanide-bridged Fe<sup>III</sup>Mn<sup>III</sup>chains constructed by mer-Fe(<scp>iii</scp>)tricyanide and Mn(<scp>iii</scp>) Schiff bases: Magnetostructural relationship
作者:In Young Yoo、Dae Won Ryu、Jung Hee Yoon、Ah Ram Sohn、Kwang Soo Lim、Beong Ki Cho、Eui Kwan Koh、Chang Seop Hong
DOI:10.1039/c1dt11293g
日期:——
Five Fe(III)Mn(III) bimetallic compounds [Fe(iqc)(CN)3][Mn(5-Xsalen)]·pMeOH·qMeCN·rH2O [Hiqc = N-(quinolin-8-yl)isoquinoline-1-carboxamide; salen = N,N′-ethylenebis(salicylideneiminato) dianion; X = H(2), F(3, 3a), Cl(4), Br(5)] were prepared by assembling a newly designed mer-Fe tricyanide (Ph4P)[Fe(iqc)(CN)3]·0.5H2O (1) and the respective Mn Schiff bases Mn(5-Xsalen)+. Compounds 2–4 show linear chain
五个Fe(III)Mn(III)双金属化合物[Fe(iqc)(CN)3 ] [Mn(5-Xsalen)]· p MeOH· q MeCN· r H 2 O [Hiqc =N-(喹啉-8-基)异喹啉-1-羧酰胺; salen = N,N'-亚乙基双(水杨基亚胺基)二价阴离子; X = H(2),F(3,3A),CL(4),溴(5)]通过组装一个新设计的制备聚体-Fe tricyanide(PH 4 P)的[Fe(IQC)(CN)3 ] ·0.5H 2 O(1)和相应的Mn Schiff碱Mn(5-Xsalen)+。化合物2-4显示直链结构,其中反式中的Fe前体桥相邻的Mn原子的-positioned氰化物,而5是一种之字形链配位聚合物,其中前体的两个氰基以顺式模式充当桥键。从线性到锯齿形的结构变化可能是由卤素的尺寸效应引起的。在溶剂化-去溶剂化方案后,可逆的结构转变发生在3和3a之间,并且相
The effect of the chelate ligand on the rate of chloride substitution from Pt(II) complexes with picolyl and isoquinolinylcarboxamide moieties on the non-leaving ligand
strength of π-backbonding of the attached ligands, which is enhanced by the strong electron withdrawing nature of the carboxamide group on the non-leaving ligands of Pt(II) complexes. Quinoline moieties of Pt5 and Pt6 lie out-of-the square plane, resulting in enhanced reactivity due to the aided entrapment of the nucleophile by the non-planar groups of the ligand. Negative activation entropies and positive