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Synthesis of selenium bridged metallacycles via oxidative addition of diaryl diselenide across Re–Re bond: Novel one-pot reaction approach by A. Vanitha; Shaikh M. Mobin; Bala. Manimaran is a Chemistry article available to read on EtoBox.

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One-pot synthesis of novel M 2 E 2 L 2 type metallacycles [L(CO) 3 Re(m-SeR) 2 Re(CO) 3 L] (1e5) was accomplished by oxidative addition of diaryl diselenide to low-valent transition metal carbonyl with monodentate pyridine ligands. In metallacycles 1e5, where L 1⁄4 pyridine ligand, R 1⁄4 C 6 H 5 , CH 2 C 6 H 5 , the pyridyl groups bonded to metal centres invariably adopted cis conformation due to pep interaction whereas, in compounds 1a and 2a, the pyridyl ligands were oriented in trans conformation. When bulky phenyl groups are introduced at para position of pyridyl rings, as in case of metallacycle 3, the steric hindrance disrupts the soft interaction and resulted into the expansion of space in between two phenylpyridyl groups and created a void. The Metallacycles 1e5 have been characterised by elemental analysis, NMR, IR, absorption and emission spectroscopic techniques. Molecular structures of 1, 1a, 2, 2a, 3 and 4 were determined by single crystal X-ray diffraction analysis and the structural studies of 1, 2, 3 and 4 revealed that the pyridyl groups attached to the metal centres exhibited cis conformation, while 1a, 2a displayed trans conformation.

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Author

A. Vanitha; Shaikh M. Mobin; Bala. Manimaran

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-328X)

Published

2011

Language

EN

Field

Chemistry (Physical Sciences)