The structural transformations of compound 1 {[Co(44pba) 2 ] 4 ·(DMF) 3 ·(EtOH) 0.25 ·(H 2 O) 4 } n [44pba = 4-(4-pyridyl) benzoate] were followed during the exchange of DMF and ethanol molecules by methanol at room temperature. .5 } n were studied using differential scanning calorimetry, thermogravimetric analysis and X-ray diffraction methods. The final phase 4 reverts back to 1 upon soaking 4 in a dry DMF-ethanol mixture as evidenced by the powder diffraction data and infrared spectra.

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... mental All chemicals were obtained from commercial sources and were used without further purification. Synthesis of 1: {[Co(44pba) 2 ] 4 ·(DMF) 3 ·(EtOH) 0.25 ·(H 2 O) 4 } n (where 44pba is 4-(4-pyridyl) benzoate) 80 mg of 4-(4-pyridyl) benzoic acid (0.4 mmol) was dissolved in 5 ml DMF with heating and stirring. 29 mg of Co(NO 3 ) 2 ·6H 2 O (0.1 mmol) was dissolved in 2 ml ethanol with stirring. The two solutions were mixed and sealed in a 15 ml Teflon lined autoclave and heated at 105°C for three days, followed by CrystEngComm, 2013, 15, 9521-9529 | 9521 This journal is CrystEngComm Paper 9522 | CrystEngComm, 2013, 15, 9521-9529 This journal is