Arylplatinum(II) complexes have been covalently bonded to the N and C termini and to the a-carbon of various amino acid derivatives. These organometallic-functionalized amino acid compounds can be converted into the corresponding free amino acids under both basic and acidic conditions; this demonstrates the excellent stability properties of these biomolecules. Due to the NMR activity displayed by the Pt-195 nucleus (natural abundance 33.8%, I = 1/2) these compounds are functional biomarkers. Furthermore, the ability of the arylplatinum functional group to bind SO2 gas, selectively and reversibly as indicated by changes in the spectroscopic properties (H-1, C-13, Pt-115 NMR and UV spectra) of these compounds, allows for the potential use of these complexes as in vitro biosensors.
Synthesis and Properties ofpara-Substituted NCN-Pincer Palladium and Platinum Complexes
作者:Martijn Q. Slagt、Gema Rodríguez、Michiel M. P. Grutters、Robertus J. M. Klein Gebbink、Wim Klopper、Leonardus W. Jenneskens、Martin Lutz、Anthony L. Spek、Gerard van Koten
DOI:10.1002/chem.200305336
日期:2004.3.19
NCN-pincer palladium(II) and platinum(II) complexes [MX(NCN-Z)] (M=Pd(II), Pt(II); X=Cl, Br, I; NCN-Z=[2,6-(CH(2)NMe(2))(2)C(6)H(2)-4-Z](-); Z=NO(2), COOH, SO(3)H, PO(OEt)(2), PO(OH)(OEt), PO(OH)(2), CH(2)OH, SMe, NH(2)) were synthesised by routes involving substitution reactions, either prior to or, notably, after metalation of the ligand. The solubility of the pincer complexes is dominated by the
多种对位取代的NCN钳夹钯(II)和铂(II)配合物[MX(NCN-Z)](M = Pd(II),Pt(II); X = Cl,Br,I; NCN- Z = [2,6-(CH(2)NMe(2))(2)C(6)H(2)-4-Z](-); Z = NO(2),COOH,SO(3) H,PO(OEt)(2),PO(OH)(OEt),PO(OH)(2),CH(2)OH,SMe,NH(2))是通过涉及取代反应的途径合成的,或者在或者,特别是在配体金属化之后。对夹配合物的溶解度受对取代基Z的性质支配,这使得几种配合物是水溶性的。通过(195)Pt NMR光谱和DFT计算研究了对位取代基对金属中心电子性能的影响。(195)Pt化学位移和计算得出的铂上自然电荷均与sigma(p)Hammett取代基常数线性相关,因此,可以预测预先设计的钳夹复合物的电子性质。对-PtI基团本身的sigma(p)值在甲醇中确定为-1
Palladium(II) pincer complexes of α-amino acids: towards the synthesis of catalytically active artificial peptides
作者:Gabriela Guillena、Gema Rodrı́guez、Gerard van Koten
DOI:10.1016/s0040-4039(02)00656-1
日期:2002.5
NCN palladium(II) complexes have been covalently attached to the N- and C-termini of l-valine and to the N-terminus of the dipeptide l-Phe-l-Val-OMe. Remarkably, the hydrolysis of the NCN-Pd(II) l-Val-OMe compound afforded the corresponding palladated, free amino acid without affecting the metal site. This deprotected amino acid could be coupled to any protein, enzyme or peptidic chain by simple peptide