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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Crystal structures and solution behaviors of dinuclear d10-metal complexes containing anions of N,N'-bis(pyrimidine-2-yl)formamidine
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Crystal structures and solution behaviors of dinuclear d10-metal complexes containing anions of N,N'-bis(pyrimidine-2-yl)formamidine

机译:含N,N'-双(嘧啶-2-基)甲am阴离子的双核d10-金属配合物的晶体结构和溶液行为

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摘要

The salts of Zn(II),Cd(II)and Hg(II)react instantaneously with Kpmf(pmf~-=anion of N,N'-bis(pyrimidine-2-yl)formaimdine,Hpmf)in THF,producing bimetallic complexes of the types[M2(pmf)3](X)(M=Zn(II),X=I_3~-,1a;M=Zn(II),X=NO_3~-,1b;M=Zn(II),X=ClO_4~-,1c;M=Cd(II),X=NO_3~-,2a;M=Cd(II),X=ClO_4~-,2b)and Hg2(pmf)2X2(X=Cl,3a;Br,3b;I,3c).New tridentate and tetradentate coordination modes were observed for the pmf~-ligands and their fluxional behaviors investigated by measuring variable-temperature ~1H NMR spectra.Complexes 2a and 2b,which possess only tetradentate coordination modes for the pmf"ligands in the solid state show larger free energy of activation(DELTA G_c)for the exchange than complexes 1a-c and 3a-c with tetradentate and/or tridentate coordination modes.Complexes 1a-c and 3a-c are the first dinuclear Zn(II)and Hg(II)complexes containing formamidinate ligands.Moreover,the separation between the two Hg(II)atoms are 3.4689(9),3.4933(13)and 3.5320(10)A for complexes 3a-c,respectively,similar to the sum of van der Waals radii of two Hg(II)atoms which is 3.50(7)A.All the complexes exhibit emissions and the nature of the anions hardly change the emission wavelengths of the complexes with the same metal centers.The emission bands may be tentatively assigned as intraligand(IL)pi-pi* transitions.
机译:Zn(II),Cd(II)和Hg(II)的盐与THF中的Kpmf(N,N'-双(嘧啶-2-基)甲酰胺,Hpmf)的阴离子瞬时反应,生成双金属[M2(pmf)3](X)(M = Zn(II),X = I_3〜-,1a; M = Zn(II),X = NO_3〜-,1b; M = Zn(II) ),X = ClO_4〜-,1c; M = Cd(II),X = NO_3〜-,2a; M = Cd(II),X = ClO_4〜-,2b)和Hg2(pmf)2X2(X = Cl ,3a; Br,3b; I,3c)。通过测量〜1H NMR变温谱图,观察到了pmf〜-配体的新三齿和四齿配位模式,并研究了它们的通量行为。仅具有四齿的复合物2a和2b与具有四齿和/或三齿配位模式的配合物1a-c和3a-c相比,固态的“ pmf”配体的配位模式显示出更大的活化激活自由能(ΔG_c)。配合物1a-c和3a-c是第一个含有甲酰胺酸配体的双核Zn(II)和Hg(II)配合物。此外,配合物3a-的两个Hg(II)原子之间的间隔分别为3.4689(9),3.4933(13)和3.5320(10)A c分别类似于两个Hg(II)原子的范德华半径之和为3.50(7)A。所有配合物均具有发射,并且阴离子的性质几乎不会改变具有相同金属中心的配合物的发射波长。发射带可以暂定为内配体(IL)pi-pi *跃迁。

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