The thermal decay of 19 individual carbonyl homo- and heterochalcogenide clusters with different M/X ratios (M = Fe, Mn, Pt, Cr, W, Mo, Re, Ru; X = S, Se, Te) was studied by differential scanning calorimetry and thermogravimetry. The process is stepwise and occurs at relatively low temperatures (100-350 degreesC). The general fact of incomplete removal of carbon monoxide (due to the formation of carbide and oxide impurities) during thermolysis of carbonyl chalcogenide clusters with the M : X ratio greater than I was elucidated. Conversely, when M : X less than or equal to I (or at any M/X ratio for clusters containing methylcyclopentadienyl groups), pure metal chalcogenides are formed.
除了早先报道的二苯基二碲化物 (Ph 2 Te 2 ) 和卤素键供体 1,4-二碘-四氟苯 ( p -DIFTB) 1α的共晶外,其两种新的多晶型(1β和1γ)呈现出罕见的长-范围超分子合成子模块多态性。与较早报道的形式1α中的 I⋯Te 卤素键 (HaB) 相比,它们的主要构建基序是 I⋯π(Ph) HaB。这种多态三元组的晶格能量计算表明从动力学到热力学形式的1α - 1β - 1γ序列。共晶1β与Ph 2 Se 2 ·( p -DIFTB) 共晶完全同构,Ph 2 Te 2分子在1β中的双链再现了纯Ph 2 Se 2的堆积和Ph 2中Ph 2 Se 2链的模式Se 2 · p -DIFTB。1γ形式的Ph 2 Te 2单链仅与1β部分相似,但是这三个多晶型共晶与天然的 Ph 2 Te一起2和Ph 2 Se 2构成了一个相当详细和显着的结构景观。它表明了Ph 2 Te 2和Ph 2 Se