CRYSTAL-STRUCTURE OF BIS(9-METHYLHYPOXANTHINE)SILVER(I) PERCHLORATE MONOHYDRATE, A MODEL COMPLEX FOR THE SILVER-POLY(I) SYSTEM
CRYSTAL-STRUCTURE OF BIS(9-METHYLHYPOXANTHINE)SILVER(I) PERCHLORATE MONOHYDRATE, A MODEL COMPLEX FOR THE SILVER-POLY(I) SYSTEM
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DOI：
10.1021/ja00530a025
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发表时间：
1980-01-01
影响因子：
15
通讯作者：
BEAUCHAMP, AL
中科院分区：
文献类型：
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作者：
BELANGERGARIEPY, F;BEAUCHAMP, AL
标题化合物的晶体属于空间群P.hivin.1，晶胞参数如下：a = 9.271（3）埃，B = 10.187（7）埃，c = 19.124（7）.埃，α。= 91.17（4）°，β。= 94.08（3）°和γ= 93.78（4）°。该结构由未配位的ClO 4-离子和平面[（9-甲基次黄嘌呤）2Ag]+阳离子组成，其中Ag与2个配体N（7）原子线性结合。配体相对于N（7）-Ag-N（7）是顺式的。羰基氧原子O（6）不与Ag结合，但它们通过H2O分子通过H键交联。这些阳离子通过H2O分子和属于不对称单元中另一个[（9-甲基次黄嘌呤）2Ag]+阳离子的H（1）质子之间形成H-键而结合成二聚体。本结构为Shin和Eichhorn在低pH下观察到的2：1聚（I）/Ag络合物提供了合理的结构模型，并提出了在较高pH下对相同体系报道的4：4络合物结构的假设。
Crystals of the title compound belong to space group P.hivin.1 with the following cell parameters: a = 9.271 (3) .ANG., b = 10.187 (7) .ANG., c = 19.124 (7) .ANG., .alpha. = 91.17 (4).degree., .beta. = 94.08 (3).degree. and .gamma. = 93.78 (4).degree.. The structure consists of uncoordinated ClO4- ions and planar [(9-methylhypoxanthine)2Ag]+ cations in which Ag is linearly bound to 2 ligand N(7) atoms. The ligands are syn with respect to N(7)-Ag-N(7). Carbonyl oxygen atoms O(6) are not bound to Ag, but they are cross-linked via H-bonding by a H2O molecule. Such cations associate into dimers by H-bond formation between the H2O molecule and a H(1) proton belonging to the other [(9-methylhypoxanthine)2Ag]+ cation in the asymmetric unit. The present structure provides a reasonable structural model for the 2:1 poly(I).sbd.Ag complex observed by Shin and Eichhorn at low pH and it suggests assumptions for the structure of the 4:4 complex reported for the same system at higher pH.