Syntheses, Crystal Structures and Antimicrobial Studies of Two New Semicarbazone Derivatives
作者:Tze Shyang Chia、Ching Kheng Quah、Chin Wei Ooi、B. Garudachari、Nishitha A. Isloor、Arun M. Isloor、Hoong-Kun Fun
DOI:10.1007/s10870-013-0483-1
日期:2014.1
Two new derivatives of semicarbazone, (E)-2-(hexan-2-ylidene)hydrazinecarboxamide and (E)-2-(heptan-2-ylidene)hydrazinecarboxamide were synthesized and characterized by IR and 1H NMR. Their crystal structures were characterized by X-ray diffraction method. Compound (I) crystallizes in triclinic $$P\overline1}$$ , a = 6.7679(7) Å, b = 7.1912(8) Å, c = 9.9969(11) Å, α = 108.824(2)°, β = 99.398(3)°, γ = 92.680(2)°, V = 451.75(8) Å3, Z = 2, R 1 = 0.043 and wR 2 = 0.140. Compound (II) crystallizes in triclinic $$P\overline1}$$ , a = 6.7192(6) Å, b = 7.2094(6) Å, c = 11.2842(11) Å, α = 103.303(2)°, β = 106.198(2)°, γ = 91.219(1)°, V = 508.70(8) Å3, Z = 2, R 1 = 0.044 and wR 2 = 0.133. Their molecules adopt a L-shape conformation with C atom in C=N double bond acting as the junction point. The C=O double bond indicate the existence of semicarbazone group in keto-like form for both compounds in their solid state. In the crystal, the carbonyl O atom for both derivatives acts as a common acceptor in the intermolecular bifurcated N–H···O hydrogen bonding which linked the molecules into one-dimensional supramolecular ribbons. Antimicrobial studies by serial dilution method showed both compounds exhibit antibacterial property. Two new semicarbazone derivatives are characterized by IR, 1H NMR and single crystal X-ray diffraction methods and their antibacterial activity was further investigated by screening against four different bacterial strains.
合成了两种新半缩脲衍生物,(E)-2-(己-2-亚基)肼基甲酰胺和(E)-2-(庚-2-亚基)肼基甲酰胺,并通过红外光谱和氢核磁共振对其进行了表征。其晶体结构通过X射线衍射方法进行了表征。化合物(I)属于三斜晶系$$P\overline1}$$空间群,a = 6.7679(7) Å,b = 7.1912(8) Å,c = 9.9969(11) Å,α = 108.824(2)°,β = 99.398(3)°,γ = 92.680(2)°,V = 451.75(8) Å3,Z = 2,R1 = 0.043,wR2 = 0.140。化合物(II)属于三斜晶系$$P\overline1}$$空间群,a = 6.7192(6) Å,b = 7.2094(6) Å,c = 11.2842(11) Å,α = 103.303(2)°,β = 106.198(2)°,γ = 91.219(1)°,V = 508.70(8) Å3,Z = 2,R1 = 0.044,wR2 = 0.133。它们的分子呈L形构型,C=N双键中的C原子作为连接点。C=O双键表明,在固态下,这两种化合物都以酮式半缩脲形式存在。在晶体中,两种衍生物的羰基O原子作为分子间分叉N–H···O氢键的共同受体,将分子连接成一维超分子带。通过系列稀释法进行的抗菌研究显示,这两种化合物均具有抗菌活性。两种新的半缩脲衍生物通过红外光谱、氢核磁共振和单晶X射线衍射方法进行了表征,并通过对四种不同细菌株进行筛选,进一步研究了它们的抗菌活性。