“…Therefore, the research on tetrazole carboxylic acid complexes is of great significance ( Aromí et al, 2011 ; Fan et al, 2021 ; Liu et al, 2012 ; Sun et al, 2012 ; Huang et al, 2013 ; Li et al, 2013 ; Chen et al, 2014 ; Liu et al, 2015 ; Liu et al, 2016 ; Wu et al, 2011 ). At present, the synthesis and structure of a variety of tetrazole carboxylic acids and their coordination complexes and properties have been studied, showing their important application value in the fields of molecular magnetism, molecular absorption, and catalysis ( Wriedt et al, 2012 ; Zou et al, 2014 ; Wu et al, 2015 ; Yang et al, 2015 ; Zou et al, 2015 ). With the in-depth study of tetrazole carboxylic acid complexes, it is found that they have special biological activities against human tumor cells ( Wriedt et al, 2013 ; Li et al, 2015 ; Sun et al, 2016 ; Zhu et al, 2016 ).…”