polymeric structures in the solid state while 3 is strictly monomeric. For compound2crystals suitable for complete structure solution could not be grown. Crystallization trials of 2 from hexane and toluene resulted in oxygen bridged tetramer [Bi2O(OCMe2iPr)4]2 (6). Compound 4 has dimericstructure and compound 5 forms loose tetramers as reported earlier. The structure of toluene solvatedcrystal [Bi(O2CtBu)3]4·2MeC6H5
在搜寻时 铋 原子层沉积(ALD)薄膜制备的前驱体3 铋醇盐Bi(O t Bu)3(1),双(OCMe 2 i Pr)3(2),双(OC i Pr 3)3(3),β-二酮酸铋, 双(三)3(4),以及羧酸铋合成并评估了Bi(O 2 C t Bu)3(5)。这些化合物的特征是中国,NMR,MS和TGA /SDTA。解决了化合物1和3的早期未知晶体结构。化合物1以固态形式形成二聚体和松散的聚合物结构,而化合物3则严格是单体。对于化合物2,适合于完整结构溶液的晶体无法生长。的结晶试验2从正己烷 和 甲苯 导致 氧 桥接的 四聚体[Bi 2 O(OCMe 2 i Pr)4 ] 2(6)。如先前所报道,化合物4具有二聚体结构,并且化合物5形成松散的四聚体。解决了甲苯溶剂化晶体[Bi(O 2 C t Bu)3 ] 4 ·2MeC 6 H 5(7)的结构。所有研究的化合物均显示出相对较好的挥发性和热稳定
Heterobimetallic complexes composed of bismuth and lithium carboxylates as polyurethane catalysts – alternatives to organotin compounds
作者:Emre Levent、Oliver Sala、Lukas F. B. Wilm、Pawel Löwe、Fabian Dielmann
DOI:10.1039/d1gc00446h
日期:——
Organotincompounds are important catalysts for the synthesis of polyurethanes consisting of aliphatic isocyanates and polyols. Due to their toxicity, however, it has been a long-standing goal to develop more environmentally benign catalysts. Bismuth octoates and neodecanoates are such well-known alternatives, but their catalytic activity is insufficient for many applications. Herein we show that the