Dependence of the distortion of the square pyramids in N,N-dimethylethylenediammonium pentachloroantimonate(III) on the geometry of hydrogen bonds

被引:16
作者
Bujak, M [1 ]
Zaleski, J [1 ]
机构
[1] Univ Opole, Inst Chem, PL-45052 Opole, Poland
来源
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2001年 / 56卷 / 06期
关键词
N; N-dimethylethylenediammonium cation; chloroantimonate(III);
D O I
10.1515/znb-2001-0608
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
N,N-Dimethylethylenediammonium pentachloroantimonate(III) crystallizes in the monoclinic system, in space group P2(1)/c (a = 12.460(2), b = 10.252(2), c 10.330(2) Angstrom, p = 97.75(3)degrees, V = 1307.5(4) Angstrom (3) Z = 4, d(c) = 1.997, d(m) = 1.99(2) g/cm(3)). The crys tal structure of [(CH3)(2)NH(CH2)(2)NH3] [SbCl5] consists of isolated [SbCl5](2-) anions and [(CH3)(2)NH(CH2)(2)NH3](2+) cations. The [SbCl5](2-) anion has a distorted square pyramidal geometry, presenting one short axial and four long equatorial Sb-Cl bonds. The square pyramids are characteristically stacked one close to the other, parallel to the c axis. The voids between the anionic sublattice are filled by [(CH3)(2)NH(CH2)(2)NH3](2+) cations. The five non-equivalent Sb-Cl bond distances within the [SbCl5](2-) square pyramid are significantly different. The equatorial Sb-Cl bonds are in the range 2.427(2)-2.968(2) Angstrom, whereas the axial one is 2.384(1)Angstrom long. The study reveals that N-H . . . Cl hydrogen bonds are responsible for the deformation of equatorial Sb-Cl bonds from the mean value of 2.654(7) Angstrom. Analysis of intermolecular interactions between the [SbCl5](2-) pyramids in the structure, reflected in changes of Sb-Cl bond lengths from the values characteristic of non-interacting pyramids, leads to the conclusion that the van der Waals radius of Sb is significantly smaller than that estimated by Pauling.
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页码:521 / 525
页数:5
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