Unusual complexation of Cu(I) by pyrimidine/pyridine-pyrazole derived ligands exploiting the molecular function of 2-mercapto-4,6-dimethylpyrimidine – Syntheses, crystal structures and electrochemistry
作者:Tarak Nath Mandal、Somnath Roy、Anil Kumar Barik、Samik Gupta、Ray J. Butcher、Susanta Kumar Kar
DOI:10.1016/j.ica.2008.06.027
日期:2009.3
chromophore. The metal centers are bridged through DpymtH in its ‘thione’ form. Interestingly, the chelation (in part) results in formation of the highly stable four-membered two chelate rings around the two tetracoordinated copper atoms in 5. The two copper centers along the long arm of the chair are separated through a distance of 5.190 A while those in the short arm are at a length of 3.629 A. The
2当量的抽象反应 2当量的三水合氯化铜(II)的量。1当量存在下,甲基-5-甲基-1-(4,6-二甲基-2-嘧啶基)吡唑-3-羧酸甲酯(DpymPzC)的合成。在pH〜6下,用2-巯基-4,6-二甲基嘧啶(DpymtH)制得三配位的铜(Ⅰ)配合物[Cu(DpymPzC)Cl](1)。在pH〜6下,以相同当量比与金属盐与六水合高氯酸铜(II)进行相同的反应,形成四配位的铜(I)络合物[Cu(DpymPzC)2] ClO4(2)。在这两种情况下,DpymtH的作用仅是还原原位形成最终铜(I)络合物的铜(II)盐。另一方面,硫氰酸铜(I)与DpymPzC之间在2:2当量之间的直接反应。生成三配位的铜(I)配合物[Cu(DpymPzC)SCN](3)。在类似的反应中2当量。2当量的三水合氯化铜(II)的量。在1当量存在下的5-甲基-1-(2-吡啶基)吡唑-3-羧酸乙酯(PyPzC)的量。在pH约为