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Two one-dimensional linear coordination polymers, [Mg(L) _ 4(H2O)] (H2L=olsalazine) and 2[Ca(L) _ 4(H2O)] were obtained from self-assembly of CaCl2 or MgSO4 with olsalazine and their structures determined by single crystal X-ray diffraction. Both complexes are onedimensional polymers, for complex 1 with crystal data: P2(1)/c, a=9.5224(18),b=11.309(2), c=16.211(3)Ǻ , ß=106.648(3)_, V=1672.6(6) Ǻ3, Z=4, R1=0.0695, wR2=0.2183, for complex 2 with crystal data: P4(3)2(1)2, a=10.4006(2), b=10.4006(2), c=32.0746(10) Ǻ , V=3469.59(14) Ǻ3, Z=8, R1=0.0332, wR2=0.1015. In the complexes,Mg and Ca adopt totally different coordination modes. Alkaline-earth Mg is six-coordinate octahedronal geometry, however, in 2, the local coordination geometry around calcium atom can be best described as a slightly distorted pentagonal bipyramid crystallizing in a homo-chiral space group. Olsalazine in both compounds also adopts dissimilar coordination modes. 1. Introduction Studies on the interaction between drugs and metal ions have special applications in medicine [1–4]. Metal complexes can improve the solubility of drugs in water [5] and increase their curative effect; olsalazine sodium can be more effectively absorbed than olsalazine [6]. Studying metal complexes of drugs, aids in understanding the coordination behavior of medicines, useful in pharmacology and in the search for better medicine. Olsalazine (3, 3-azo-bis (6-hydroxybenzoic acid), has been widely used to prevent and treat inflammatory bowel diseases, such as ulcerative colitis [7–9]. Although the sodium, potassium [10], calcium [11] and copper [12] complexes of olsalazine have been reported, other complexes with this molecule have not been reported. In previous work, we have reported a series of Cd, Co and Zn complexes [13] of osalazine with the auxiliary ligand 1,10-phenanthroline. Variation of ligands for bridging and conformational preference as well as the metal ions has a profound influence on the polymeric structures obtained [14]. Herein we report the self-assembly of olsalazine with different alkaline-earth metal salts, which yields two different onedimensional coordination polymers 1 [Mg(L) •4(H2O)] (H2L=olsalazine) and 2 [Ca(L) •4(H2O)], their solid state structures and thermal stabilities.1. Introduction Studies on the interaction between drugs and metal ions have special applications in medicine [1–4]. Metal complexes can improve the solubility of drugs in water [5] and increase their curative effect; olsalazine sodium can be more effectively absorbed than olsalazine [6]. Studying metal complexes of drugs, aids in understanding the coordination behavior of medicines, useful in pharmacology and in the search for better medicine. Olsalazine (3, 3-azo-bis (6-hydroxybenzoic acid), has been widely used to prevent and treat inflammatory bowel diseases, such as ulcerative colitis [7–9]. Although the sodium, potassium [10], calcium [11] and copper [12] complexes of olsalazine have been reported, other complexes with this molecule have not been reported. In previous work, we have reported a series of Cd, Co and Zn complexes [13] of osalazine with the auxiliary ligand 1,10-phenanthroline. Variation of ligands for bridging and conformational preference as well as the metal ions has a profound influence on the polymeric structures obtained [14]. Herein we report the self-assembly of olsalazine with different alkaline-earth metal salts, which yields two different onedimensional coordination polymers 1 [Mg(L) •4(H2O)] (H2L=olsalazine) and 2 [Ca(L) •4(H2O)], their solid state structures and thermal stabilities. 2. Experimental Olsalazine sodium was purchased locally; other chemicals and solvents were purchased from Aldrich and used as received. The FT-IR spectra were recorded as KBr pellets in the range 4000–400 cm-1 on a Nicolet Inpact 170S FT-IR spectrometer. Elemental analysis was performed on Perkin-Elmer 240C elemental analyzer. |
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beata
金蟲 (小有名氣)
- 翻譯EPI: 2
- 應(yīng)助: 0 (幼兒園)
- 金幣: 2047.8
- 帖子: 57
- 在線: 12.5小時(shí)
- 蟲號(hào): 894248
- 注冊(cè): 2009-11-05
- 專業(yè): 金屬材料的力學(xué)行為
denjiapin(金幣+4, 翻譯EPI+1):謝謝！ 2010-05-05 13:30:36
| 通過CaCl2 或 MgSO4與偶氮水楊酸自組裝，合成了兩種一維線性配位聚合物Mg(L) _ 4(H2O)] (H2L=olsalazine) 和 2[Ca(L) _ 4(H2O)]，并用單晶X射線衍射表征其結(jié)構(gòu)。兩種復(fù)合物都是一維高分子，復(fù)合物1晶體數(shù)據(jù)如下：P2(1)/c, a=9.5224(18),b=11.309(2), c=16.211(3)Ǻ , ß=106.648(3)_, V=1672.6(6) Ǻ3, Z=4, R1=0.0695, wR2=0.2183，復(fù)合物2晶體數(shù)據(jù)如下：P4(3)2(1)2, a=10.4006(2), b=10.4006(2), c=32.0746(10) Ǻ , V=3469.59(14) Ǻ3, Z=8, R1=0.0332, wR2=0.1015.在這兩種復(fù)合物中，Mg和Ca采用完全不同的配位模式。堿稀土鎂是六配位八面體結(jié)構(gòu)，然而，2中，鈣原子周圍的配位結(jié)構(gòu)可以表述為輕微扭曲的同質(zhì)手性空間群中的五角雙錐晶體。兩種化合物中的偶氮水楊酸同樣采取不同的配位模式。 |
2樓2010-05-05 12:47:45
beata
金蟲 (小有名氣)
- 翻譯EPI: 2
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- 專業(yè): 金屬材料的力學(xué)行為
denjiapin(金幣+4):謝謝幫助！ 2010-05-05 13:31:05
|
1．前言 藥物與金屬離子相互作用的研究在醫(yī)學(xué)上有特殊應(yīng)用[1-4]。金屬配合物可提高藥物在水中的溶解度[5]，并增加其療效;奧沙拉嗪鈉比奧沙拉嗪[6]更能有效吸收。藥物金屬配合物的研究，旨在幫助了解藥物的協(xié)同行為，對(duì)藥理學(xué)和尋找更好的藥物非常有用。奧沙拉嗪（3,3 -偶氮二（6 -羥基酸），已被廣泛用于預(yù)防和治療炎癥性腸道疾病，如潰瘍性結(jié)腸炎[7-9]�，F(xiàn)在已有關(guān)于鈉，鉀[10]，鈣[11]和銅[12]奧沙拉嗪配合物的報(bào)道，然而這種分子的其他配合物卻尚未見報(bào)道。在以前的工作中，我們研究了奧沙拉嗪和輔助配體鄰菲羅啉的一系列鎘，鈷，鋅配合物 [13]。配體以及金屬離子的橋接和構(gòu)象變化，對(duì)獲得的高分子結(jié)構(gòu)具有很大的影響 [14]。在此我們通過奧沙拉嗪與不同堿土金屬鹽自組裝，產(chǎn)生了兩種不同的一維配位聚合物1和2，并研究其固態(tài)結(jié)構(gòu)和熱穩(wěn)定性。 |
3樓2010-05-05 13:09:53
beata
金蟲 (小有名氣)
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4樓2010-05-05 13:13:24
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