Calcium Complexes of Carboxylate-Containing Polyamide with Sterically Disposed NH···O Hydrogen Bond: Detection of the Polyamide in Calcium Carbonate by13C Cross-Polarization/Magic Angle Spinning Spectra
Calcium Complexes of Carboxylate-Containing Polyamide with Sterically Disposed NH···O Hydrogen Bond: Detection of the Polyamide in Calcium Carbonate by13C Cross-Polarization/Magic Angle Spinning Spectra
复制标题
具有空间排列NH·O氢键的含羧酸盐聚酰胺钙络合物：用13C交叉偏振/魔角旋转光谱检测碳酸钙中的聚酰胺
DOI：
10.1021/ma9716847
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发表时间：
1998
期刊：
影响因子：
5.5
通讯作者：
A. Nakamura
中科院分区：
文献类型：
--
作者：
N. Ueyama;Tsutomu Hosoi;Yusuke Yamada;Mototsugu Doi;T. Okamura;A. Nakamura
以2，6-二氨基苯甲酸、二甲基丙二酰氯、间苯二甲酰氯、富马酰二氯为原料合成了含羧酸酯的聚酰胺。这些聚合物，{NHC 6 H3-（COO）NHCOC（CH 3）2CO} n，{NHC 6 H3（COO）NHCO-m-C6 H4 CO} n和{NHC 6 H3（COO）NHCO-trans-CH= CHCO} n，在一个聚合物链上有7 ~ 8个羧酸单元，它们的Ca（II）配合物具有NH. O氢键，这阻止了Ca O的水解解离。在[Ca 2+ ]/ [单体单元] = 100的条件下，由Ca 2+和CO 32-水溶液生成CaCO 3，得到方解石、球文石和/或它们的混合物。利用13 C交叉极化/魔角旋转固体核磁共振技术，我们能够观察到CaCO 3中的聚合物。在这些研究中，羧酸盐与Ca（II）的结合似乎是一个重要因素，可能与CaCO 3的生物矿化有关。
Carboxylate-containing polyamides were synthesized from 2,6-di(amino)benzoic acid and dimethylmalonyl dichloride, isophthaloyl dichloride, and fumaryl dichloride. These polymers, {NHC 6 H 3 -(COO)NHCOC(CH3) 2 CO} n ,{NHC 6 H 3 (COO)NHCO-m-C 6 H 4 CO} n and {NHC 6 H 3 (COO)NHCO-trans-CH= CHCO} n , have seven to eight carboxylate units in a polymer chain, and their Ca(II) complexes possess NH…O hydrogen bonds, which prevents the Ca-O dissociation by hydrolysis. CaCO 3 was obtained from aqueous Ca 2+ and CO 3 2- in the presence of the polyamide or the Na salt of these polyamides ([Ca 2+ ]/ [monomer unit] = 100) to give calcite, vaterite, and/or their mixture. We were able to observe polymers in CaCO 3 utilizing the 13 C cross-polarization/magic angle spinning solid-state NMR. The binding of Ca(II) by carboxylate appears to be an important factor in these studies and may be relevant to biomineralization of CaCO 3 .