半胱氨酸在维持细胞氧化还原稳态中起着重要作用,半胱氨酸浓度的扰动与心血管疾病,肝脏疾病和癌症有关。19 F MRI由于其高的组织穿透力和可忽略的生物学背景信号,在生物学上是检测半胱氨酸的一种有前途的方法。在这里,我们报告氟化的大环铜配合物,其通过半胱氨酸还原Cu(II)配合物后显示19 F NMR / MRI开启响应。与半胱氨酸的反应性是通过在加入半胱氨酸后结合紫外可见光谱和EPR光谱仪监测强大的抗磁性19 F信号的出现来研究的。重要的是,与–CH 2 CF的配合物3个标签显示出良好的水溶性。在HeLa细胞中对该复合物进行的研究表明,这些探针可用于在复杂的生物环境中检测半胱氨酸。
Cyclam-based iron(<scp>iii</scp>) and copper(<scp>ii</scp>) complexes: synthesis, characterization and application as antifungal agents
作者:Stephanie Almada、Luísa B. Maia、João C. Waerenborgh、Bruno J. C. Vieira、Nuno P. Mira、Elisabete R. Silva、Fátima Cerqueira、Eugénia Pinto、Luis G. Alves
DOI:10.1039/d2nj03161b
日期:——
cis complex is the major product of both reactions. The EPR data of [H2(4-CF3PhCH2)2Cyclam}Cu](CH3COO)2·2H2O are consistent with two distinct Cu2+ species, whose solid state molecular structures were determined by single crystal X-ray diffraction and correspond to complexes displaying octahedral and square–pyramidal geometries. The screening of the antifungal activity of both metal complexes revealed
Novel cyclam multicomponent crystal forms: synthesis, characterization and antimicrobial activity
作者:Rajaa Saied、Paula C. Alves、Patrícia Rijo、Vânia André、Luis G. Alves
DOI:10.1039/d3ce00354j
日期:——
Novel multicomponent crystal forms were obtained from reactions of trans-disubstituted cyclam derivatives with flufenamic and salicylic acids.
反式二取代的环胺衍生物与氟苯胺酸和水杨酸的反应获得了新的多组分晶体形式。
Structural features of neutral and cationic cyclams
作者:Luis G. Alves、M. Teresa Duarte、Ana M. Martins
DOI:10.1016/j.molstruc.2015.05.037
日期:2015.10
Dicationic compounds of general formula [1,8-R-2-1,4,8,11-tetraazatricyclo[9.3.1.1(4,8)]hexadecane]X-2, where R = H, Me or Bn' and X is a halogen counterion were obtained by reactions of 1,4,8,11-tetraazatricyclo[9.3.1.1(4,8)]hexadecane with different electrophiles. The solid-state molecular structures of the compounds reveal that the hydrogen, methyl or benzyl groups are located on the nitrogen atoms that are not only the less sterically hindered but also have the electron lone pair pointing out of the macrocycle backbone. In all compounds it is observed a bond shortening between the N-C-aminal and the two other C-N bonds that may be attributed to an inductive effect. These compounds afford the corresponding trans-N,N'-disubstituted cyclams upon hydrolysis in basic medium. (C) 2015 Elsevier B.V. All rights reserved.
Reactivity of a new family of diamido-diamine cyclam-based zirconium complexes in ethylene polymerization
作者:Luís G. Alves、Maria Augusta Antunes、Inês Matos、Rui F. Munhá、M. Teresa Duarte、Anabela C. Fernandes、M. Mercês Marques、Ana M. Martins
DOI:10.1016/j.ica.2010.02.018
日期:2010.5
Compounds of general formula [(*Bn(2)Cyclam)ZrCl(2)] (*Bn = 4-(t)BuC(6)H(4)CH(2), (4) and 4-CF(3)C(6)H(4)CH(2), ( 5)) were synthesised using Zr(CH(2)SiMe(3))(2)Cl(2)(Et(2)O)(2) and the corresponding ligand precursors 1,8-(4-(t)butylbenzyl)-1,4,8,11-tetraazacyclotetradecane (H(2)(4-(t)BuBn)(2)Cyclam), (4a), and 1,8-(4-trifluoromethylbenzyl)-1,4,8, 11-tetraazacyclotetradecane (H(2)(4-CF(3)Bn)(2)Cyclam), (5a). Complexes 4 and 5, in addition to other [(*Bn(2)Cyclam)ZrCl(2)] compounds previously described by some of us (*Bn = PhCH(2), ( 1), 3,5-Me(2)C(6)H(3)CH(2), (2) and 3,5-(t)Bu(2)C(6)H(3)CH(2), (3)) were tested in the polymerization of ethylene in the presence of MAO. System 4/MAO presents the highest activity ( 2790 g PE molZr(-1) h(-1) atm(-1)). The polymers formed are slight to moderately branched polyethylenes with a percentage of branching ranging between 1.2% and 3.3%. The melting points obtained by differential scanning calorimetry (DSC) ranging from 128 to 140 degrees C, are consistent with rather high average molecular weight polymers with crystallinity close to 50%. (C) 2010 Elsevier B. V. All rights reserved.
Copper(<scp>ii</scp>) complexes for cysteine detection using <sup>19</sup>F magnetic resonance
作者:José S. Enriquez、Meng Yu、Bailey S. Bouley、Da Xie、Emily L. Que
DOI:10.1039/c8dt03780a
日期:——
macrocyclic copper complexes that display a 19F NMR/MRI turn-on response following reduction of the Cu(II) complexes by cysteine. The reactivity with cysteine was studied by monitoring the appearance of a robust diamagnetic 19F signal following addition of cysteine in conjunction with UV-vis and EPR spectroscopies. Importantly, complexes with –CH2CF3 tags display good water solubility. Studies with this complex
半胱氨酸在维持细胞氧化还原稳态中起着重要作用,半胱氨酸浓度的扰动与心血管疾病,肝脏疾病和癌症有关。19 F MRI由于其高的组织穿透力和可忽略的生物学背景信号,在生物学上是检测半胱氨酸的一种有前途的方法。在这里,我们报告氟化的大环铜配合物,其通过半胱氨酸还原Cu(II)配合物后显示19 F NMR / MRI开启响应。与半胱氨酸的反应性是通过在加入半胱氨酸后结合紫外可见光谱和EPR光谱仪监测强大的抗磁性19 F信号的出现来研究的。重要的是,与–CH 2 CF的配合物3个标签显示出良好的水溶性。在HeLa细胞中对该复合物进行的研究表明,这些探针可用于在复杂的生物环境中检测半胱氨酸。