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根据空腔模型中的经验结合规律，提出了各种含氧配位体与ＴｃＯ３＋的结合能力：ＨＯ－～ＲＯ－＞ＡｒＯ－＞Ｒ－ＰＯ３Ｈ－＞Ｒ－ＣＯ－２＞Ｃ＝Ｏ。在此序列和五配位四方锥构型基础上，解释了各氧多齿配体与ＴｃＯ３＋的结合性质。由于ＴｃＯ（ＯＨ）－４容易岐化为ＴｃＯ２·ｘＨ２Ｏ和ＴｃＯ－４，因而任何单齿氧ＴｃＯ３＋核配合物在水溶液中皆不稳定。多元醇、邻二酚、α羟基膦酸、α羟基羧酸的ＴｃＯ３＋配合物由于螯合效应，可能在水溶液中存在。
According to the rule of experience in the cavity model, the binding capacity of various oxygen-containing ligands to TcO3 + is proposed: HO- ~ RO-> ArO-> R-PO3H-> R-CO-2> C = O. Based on this sequence and the five-coordination tetragon conformation, the binding properties of the oxygen polydentate ligands to TcO3 + were explained. Because TcO (OH) -4 is readily disproportionated to TcO2 · xH2O and TcO-4, any monodentate oxygen TcO3 + core complex is unstable in aqueous solution. Polyols, ortho-diphenols, α-hydroxyphosphonic acids, and TcO3 + complexes of α-hydroxycarboxylic acids may be present in aqueous solutions due to chelation effects.