Catalytic activity correlation of Ni(Ⅱ),Co(Ⅱ) and Pd(Ⅱ)complexes to metal atom net charge

• 来源期刊: 中国科学B辑(英文版)
• 年，卷（期）: 2009,（1）
• 页码范围: 48-55
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s11426-008-0112-6

摘要

The metal atom net charge correlation (MANCC) method was developed in prediction of catalyst activity of asymmetric late-transition metal complexes, 2-quinoxalinyl-6-iminopyridine Ni(Ⅱ), 2-imino-1, 10-phenanthroline Co(Ⅱ) and 2-methoxycarbonyl-6-iminopyridine Pd(Ⅱ) complexes, from the net charge of the metal atom for ethylene polymerization. Dreiding force field was modified according to the X-ray diffraction data. We found that the asymmetric structure of the complexes resulted in a charge differ-ence between two halogen atoms coordinated to the metal atom. In order to remove such contribution we introduced the effective charge Qeff which was obtained by the charge equilibration (QEq) approach. The results verified the successful introduction of Qeff and showed that the catalytic activities of dif-ferent complexes are related to central metal atom effective charge.