Nickel(II) and Zinc(II) Dibenzoylmethanates: Molecular and Crystal Structure, Polymorphism, and Guest- or Temperature-Induced Oligomerization
作者:D. V. Soldatov、A. T. Henegouwen、G. D. Enright、C. I. Ratcliffe、J. A. Ripmeester
DOI:10.1021/ic000981g
日期:2001.3.1
Four forms of nickel(II) and two of zinc(II) dibenzoylmethanates have been isolated and characterized with powder and single-crystal X-ray diffraction analyses, differential scanning calorimetry, magnetic susceptibility measurements, and solid-state 13C cross-polarization/magic angle spinning NMR. Nickel dibenzoylmethanate, Ni(DBM)2 (DBM = PhCOCHCOPh-), forms three polymorphic forms (light-green, brown
分离并通过粉末和单晶X射线衍射分析,差示扫描量热法,磁化率测量以及固态13C交叉极化/磁性分离并表征了四种形式的镍(II)和两种锌(II)的二苯甲酰锌。角旋转NMR。甲基二苯甲酰镍镍(Ni(DBM)2(DBM = PhCOCHCOPh-))形成三种多晶型形式(浅绿色,棕色和绿色),第四种包合物形式包括客体苯。浅绿色的多晶型物是亚稳的。取代的苯诱导多晶型物重结晶为稳定的棕色形式(C30H22NiO4; a = 26.502(3)A,b = 5.774(1)A,c = 16.456(2)A,beta = 116.03(1)度;单斜晶,C2 / c; Z = 4)。与其他形式不同,棕色形式是反磁性的,由低旋转[Ni(DBM)2]配合物的单体组成。Ni(II)在方形平面环境中被两个DBM配体螯合,被四个供体氧原子螯合。加热后,棕色形式转变为绿色形式,在202摄氏度以上稳定(C90H66Ni3O12;