title: DMF/H2O volume ratio controls the syntheses and transformations of a series of cobalt complexes constructed using a rigid angular multitopic ligand.
abstract: Through middle-temperature solvothermal reactions of CoCl(2).6H(2)O with the rigid-angled ligand 3-(2'-pyridyl)-5-(4''-pyridyl)-1,2,4-triazole (Hdpt24), we obtained the three cobalt complexes {[Co(dpt24)(2))](3).4DMF.1.5H(2)O}(n) (1), {[Co(dpt24)(2))](2).H(2)O}(n) (2), and Co(dpt24)(2)(Hdpt24).H(2)O] (4) at N,N-dimethylformamide (DMF)/H(2)O volume ratios of 9:1, 1:1, and 0:1, respectively. Interestingly, 1 underwent transformations into 2, {[Co(dpt24)(2)].0.5DMF}(n) (3), and 4 when treated with DMF/H(2)O at volume ratios of 1:1, 1:9, and 0:1, respectively. Moreover, 3 and 4 converted back to 1 in 9:1 DMF/H(2)O and to 2 in 1:1 DMF/H(2)O; 3 transformed into 4 in H(2)O and vice versa in 1:9 DMF/H(2)O. Structurally, 1 is a three-dimensional (3D) 2-fold interpenetrating distorted NbO-type complex, 2 possesses a two-dimensional layer metal-organic framework, 3 is a 3D 2-fold interpenetrating typical NbO-type complex, and 4 is a wheel-shaped mononuclear neutral complex. This approach, using a mixed solvent's component ratio to direct the syntheses and conversions of four cobalt complexes, provides unprecedented control for crystal engineering.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry and Material Sciences, Northwest University, Xi'an 710069, People's Republic of China.
authors.forename: Ai-Yun
authors.initials: AY
authors.lastname: Fu
authors.forename: Yu-Lin
authors.initials: YL
authors.lastname: Jiang
authors.forename: Yao-Yu
authors.initials: YY
authors.lastname: Wang
authors.forename: Xiao-Nan
authors.initials: XN
authors.lastname: Gao
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Yang
authors.forename: Lei
authors.initials: L
authors.lastname: Hou
authors.forename: Qi-Zhen
authors.initials: QZ
authors.lastname: Shi
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004126:Dimethylformamide / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D012995:Solubility; D014867:Water / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D014867:Water; D003035:Cobalt; D004126:Dimethylformamide