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首页> 外文期刊>Studia Universitatis Babes-Bolyai. Series Physica >SPECTROSCOPIC STUDIES OF SOME METALLIC COMPLEXESWITH PHENYLALANINE AS LIGAND
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SPECTROSCOPIC STUDIES OF SOME METALLIC COMPLEXESWITH PHENYLALANINE AS LIGAND

机译：苯丙氨酸作为配体的某些金属配合物的光谱学研究

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The [Cu(L)_2]H_2O (1), [Co(L)_2]-2H_2O (2) and [Zn(L)_2]H_2O (3) metallic complexes with phenylalanine (L) as ligand were synthesized in aqueous solution and characterized by means of atomic absorption, elemental analysis, differential scanning calorimetry, FT-IR, UV-VIS and ESR spectroscopies. The elemental analysis and atomic absorption spectroscopy measurements confirm the ratio 1:2 metal ion: henylalanine composition for the synthesised compounds. The comparative analysis of the IR spectra for the ligand and the complexes indicate the coordination of the metallic centre to the carboxylic oxygen atom and the nitrogen atom of the amino group due to the shift of the v_s(C=O) and v_s(N–H) stretching vibrations. In the ligand spectrum the v(N–H) stretching vibration appears splitted at 3078 cm~(-1) and 3030 cm~(-1) and is shifted at 3320 cm~(-1) and 3256 cm~(-1) in the copper complex, at 3220 cm~(-1) in the cobalt spectrum and at 3256 cm~(-1) and 3334 cm~(-1) for the zinc complex proving the involvement of the –NH_2-group in the complex formation. The v(C=O) stretching vibration emerge in the ligand spectrum at 1623 cm~(-1) and appears to be shifted toward higher wave numbers with 4 cm~(-1) and 10 cm~(-1) for Cu and Co complexes and with 9 cm~(-1) toward lower wave numbers for Zn complex. The free ligand and the complexes exhibit similar spectra in the UV region in relation to the number of absorption bands. The n→π~* characteristic band. in the UV spectra assigned to the C=O bond appear at 231 nm for phenylalanine and is shifted toward lower wave lengths in the complexes spectra proving the covalent nature of the metal-ligand bond. Powder ESR spectra at room temperature are typically for monomeric species with pseudotetrahedral symmetry around the copper ions and octahedral environment for the cobalt ion.
机译：以苯丙氨酸（L）为配体合成了[Cu（L）_2] H_2O（1），[Co（L）_2] -2H_2O（2）和[Zn（L）_2] H_2O（3）金属配合物解决方案，并通过原子吸收，元素分析，差示扫描量热法，FT-IR，UV-VIS和ESR光谱进行表征。元素分析和原子吸收光谱测量结果证实了合成化合物的金属离子与苯丙氨酸比例为1：2。对配体和配合物的红外光谱的比较分析表明，由于v_s（C = O）和v_s（N–的移动，金属中心与氨基的羧基氧原子和氮原子的配位H）伸展振动。在配体光谱中，v（NH）的拉伸振动在3078 cm〜（-1）和3030 cm〜（-1）处分开，在3320 cm〜（-1）和3256 cm〜（-1）处偏移。在铜配合物中，在钴光谱中为3220 cm〜（-1），在锌配合物中为3256 cm〜（-1）和3334 cm〜（-1），证明了–NH_2-基团参与了配合物编队。 v（C = O）拉伸振动出现在1623 cm〜（-1）的配体谱中，并且似乎向较高波数移动，Cu和C分别为4 cm〜（-1）和10 cm〜（-1）。钴配合物，Zn配合物的波数为9 cm〜（-1）。相对于吸收带的数目，游离配体和络合物在UV区域显示相似的光谱。 n→π〜*特征带。分配给C = O键的UV光谱中的苯丙氨酸的峰在231 nm处出现，并向配合物光谱中的较低波长偏移，从而证明了金属-配体键的共价性质。室温下的粉末ESR谱图通常是针对铜离子周围具有拟四面体对称性的单体物质以及钴离子的八面体环境。

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