Effects of Anion and Bipyridyl Bridging Ligand Identity on the Co(II) Coordination Networks

详细信息    查看全文

• 作者：Lilia Croitor ; Eduard B. Coropceanu ; Diana Chisca ; Svetlana G. Baca ; Jan van Leusen ; Paul K枚gerler ; Polina Bourosh ; Victor Ch. Kravtsov ; Daria Grabco ; Constantin Pyrtsac ; Marina S. Fonari
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：June 4, 2014
• 年：2014
• 卷：14
• 期：6
• 页码：3015-3025
• 全文大小：739K
• 年卷期：v.14,no.6(June 4, 2014)
• ISSN：1528-7505

文摘

Five new coordination polymers, {[Co(OAc)₂(bpe)(H₂O)]路0.5(dmf)}_n (1), {[Co(bpy)₂(H₂O)₄][Co(tfa)(bpy)₂(H₂O)₃](tfa)₃路1.5(bpy)}_n (2), [Co(tfa)₂(dps)₄]_n (3), {[Co(tfa)₂(bpe)₄]路H₂O}_n (4), and [Co(tfa)₂(bpp)₄]_n (5) (where AcO^{鈥?/sup> = CH₃CO₂鈥?/sup>; tfa鈥?/sup> = CF₃CO₂鈥?/sup>; bpy = 4,4鈥?bipyridine; bpe = 1,2-bis(4-pyridyl)ethane; bpp = 1,3-bis(4-pyridyl)propane; dps = 4,4鈥?dipyridyl sulfide; dmf = N,N鈥?dimethylformamide) were synthesized by the reactions of Co(OAc)₂路4H₂O and Co(tfa)₂路4H₂O with different dipyridyl ligands and characterized by elemental analysis, IR spectra, and X-ray single-crystal diffraction. Compound 1 exhibits extended two-dimensional (2D) networks through the bridging AcO鈥?/sup> and bpe ligands. The polymeric motifs in 2鈥?b>5 are exclusively based on bipyridine-type ligands and results in 1D cationic chains in 2, similar charge-neutral double tapes in 3 and 4, and a 2D polymeric network in 5. In 2鈥?b>5, the tfa anions coordinate to the Co(II) center in a monodentate mode. An impact of the anion鈥檚 fluorination on coordination modes and supramolecular architectures is registered. Magnetic measurements reveal almost vanishing exchange interactions in the layered materials 1 and 5. The correlation of mechanical properties and crystal structure has been demonstrated for 1.}