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The guanidinium t-diaqua-bis(oxalato)chromate(III) dihydrate complex: synthesis, crystal structure, EPR spectroscopy and magnetic properties
Zeitschrift für Naturforschung B ( IF 0.8 ) Pub Date : 2021-04-01 , DOI: 10.1515/znb-2021-0006
Idelle Nono Kamga 1 , Augustin Nkwento Nana 1 , Bridget Ndoye Ndosiri 1 , Frédéric Capet 2 , Michel Foulon 3 , Justin Nenwa 1
Affiliation  

A new salt (CH 6 N 3 )[ t -Cr(C 2 O 4 ) 2 (H 2 O) 2 ]·2H 2 O ( 1 ) (CH 6 N 3 + = guanidinium cation) has been synthesized and characterized by single-crystal X-ray diffraction, FT-IR and UV–Vis spectroscopies, elemental and thermogravimetric analyses. In the crystal structure of 1 , the chromate(III) ion lies on an inversion center in the form of an elongated octahedron. The coordination sphere consists of four oxygen atoms of two chelating oxalato ligands in the equatorial plane and two axial oxygen atoms of water ligands. The structural feature of focal interest in the structure of 1 is the formation of pillars of [Cr(C 2 O 4 ) 2 (H 2 O) 2 ] − complex anions and CH 6 N 3 + guanidinium cations, with the next-neighbor cations rotated by an angle of 60° relative to each other. O–H···O and N–H···O hydrogen bonds play an important role in the construction of the three-dimensional network. The electron paramagnetic resonance (EPR) and magnetic properties of 1 have also been investigated.

中文翻译:

胍盐二水合双(草酸酯)铬酸盐(III)络合物:合成,晶体结构,EPR光谱和磁性能

合成了一种新的盐(CH 6 N 3)[t -Cr(C 2 O 4)2(H 2 O)2]·2H 2 O(1)(CH 6 N 3 + =胍鎓阳离子),并通过以下方法表征单晶X射线衍射,FT-IR和UV-Vis光谱学,元素分析和热重分析。在1的晶体结构中,铬酸根(III)离子以细长的八面体形式位于反转中心。配位球由赤道平面上的两个螯合草酸酯配体的四个氧原子和水配体的两个轴向氧原子组成。在结构1中焦点关注的结构特征是[Cr(C 2 O 4)2(H 2 O)2]-络合物阴离子和CH 6 N 3 +胍盐阳离子的形成,与之相邻。阳离子相对于彼此旋转了60°的角度。O–H··O和N–H···O氢键在三维网络的构建中起着重要作用。还研究了电子顺磁共振(EPR)和1的磁性。
更新日期:2021-04-14
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