Heterobimetallic complexes of Mo–μ-O–M (M = Ca, Sr, Ba) with alkaline earth metals based on a flexible dentate (Me3tacn)MoO3 unit as a metalloligand

• Published in: Journal of molecular structure Vol. 1302; p. 137398
• Main Authors: Cheng, Yao, Xu, Qian-Ya, Gao, Yang, Wu, Zhong-Qi, Jia, Ai-Quan, Zhang, Qian-Feng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2024
• Subjects: Heterobimetallic complex; Metalloligand; Molybdenum(VI) trioxide; Organometallic oxo complexes; Synthesis; Heterobimetallic complex; Synthesis; Organometallic oxo complexes; Molybdenum(VI) trioxide; Metalloligand
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2023.137398

•Coordination of the (Me3tacn)MoO3 metalloligand towards Ca/Sr/Ba salts were studied.•The prepared heterobimetallic complexes were characterized by X-ray crystallography.•The (Me3tacn)MoO3 metalloligand is of good connectivity and rich coordination modes. In this paper, we discussed the connection characteristics of the neutral weak donor metalloligand (Me3tacn)MoO3∙H2O (1) (Me3tacn = 1,4,7-trimethyl-1,4,7-triazaocynonane) and the formation of Lewis acid base adducts on the nitrates of alkaline-earth metals. Five heterobimetallic complexes {η1-(Me3tacn)MoO3}Ca(η2-NO3)2(H2O)3 (2), [{η1-(Me3tacn)MoO3}Ca(η2-NO3)2{η2,μ2-(Me3tacn)MoO3}]2 (3), {η1-(Me3tacn)MoO3}4Ca(η2-NO3)2∙12H2O (4), [{η2,μ2-(Me3tacn)MoO3}Sr(H2O)6]2Cl4∙2H2O (5), and {η2-(Me3tacn)MoO3}4Ba(η2-NO3)2∙8H2O (6) were synthesized and the crystal structures of the complexes were determined by X-ray crystallography. It is found that the (Me3tacn)MoO3 metalloligand was of good connectivity and rich coordination modes. Moreover, the complexes were characterized by infrared, fluorescence and UV-vis spectroscopies. The stability of complexes 2−6 at different temperatures was analyzed by thermogravimetry, and the antibacterial activity of the complexes was explored by disk diffusion method. Coordination of the (Me3tacn)MoO3 metalloligand towards Ca/Sr/Ba salts affords a variety of heterobimetallic complexes with different nuclearity through one or two terminal oxygens. [Display omitted]