Emeritus Professor ANG How Ghee


B.Sc., 1961, University of Malaya; M.Sc., 1962, University of Malaya; Ph.D., 1965, Monash University; M.A., Ph.D., 1967, Cambridge University; D.Sc., 1985, National University of Singapore

Contact Information
Department of Chemistry, NUS 
3 Science Drive 3 
Singapore 117543 
Office: S9-03-09 
Tel: (65)-6516-2662 
Fax: (65)-6779-1691
Email: chmanghg@nus.edu.sg


Research Interests

Organometallic Chemistry


Our research interests lie in the areas of fluorine, organometallic and cluster chemistry with special focus on synthesis, reactivity and structural studies.

The perfluoroalkyl, -aryl and -nitroxyl species have been found to display a wide range of chemical reactivity. Novel condensation reactions have led to the discovery of a new class of unsaturated inorganic molecules like:

CF3N=AsH,
CF3N=PON(CF3)2,
CF3N=GeH2
and other highly conjugated structures of P(IV) and As(IV) , hitherto unknown:
(CF3)2M=N=PPh3 M = P, As
(CF3)2P=N=P(CF3)2=N=PPh3

The structural isomers of cyclophosphines bonded to Ru and Os carbonyl clusters have been studied, using phosphorus-31 two-dimensional NMR and X-ray method.

We have found that the phosphoryl, phosphido and phosphonidene species, thermally generated, generated, can be captured by Ru and Os carbonyl clusters to afford many derivatives possessing unusual structures and bonding modes.

Linear triosmium cluster A and its analogues were found to be ideal building-blocks in the systematic synthesis of high nuclearity carbonyl clusters. Their "metal hydride coupling" reactions with clusters containing labile ligand led to "spiked" clusters (L= CO or NCMe), were intermediates in the formation of closed clusters, and which provide the elusive evidence that have enabled the mechanism for the transformation of the "spiked" clusters to be proposed.



Representative Publications

  • H. G. Ang, S. G. Ang and S. Du. Reactions Of Spiked And Open Chain Cluster Hydrides With Au Complexes: Skeletal Rearrangement And Crystal Structures Of Heterometallic Clusters [Au2Ru4(CO)12 (m3- PCF3)2(PPh3)2] and [Au2Ru4(CO)12(m3-PCF3)2 (PPh3)2]. J. Organomet. Chem., 589 133-137 (1999).

  • H. G. Ang, S. G. Ang and S. Du. The Reaction Of Bis(Trifluoro Methyl)Phosphine And Arsine With Trinuclear Ruthenium Carbonyl Cluster: Molecular Structures Of The Trinuclear And Double-Linked Trinuclear Cluster[Ru3(CO)10(m-P(CF3)2}2] and [{Ru3(CO)10(m-P(CF3)2}2]. J. Organomet. Chem., 590 1-6 (1999).

  • H. G. Ang, S. G. Ang and S. Du. Acetylene Incorporation Into The Spiked Framework Of The Phosphinidene And Arsenidene Clusters [Ru4(CO)13(m-H)2(m4-ECF3)] (E = P, As): Skeletal Re-Arrangement And Crystal Structures Of A Series Of Tetranuclear Ruthenium Cluster Bearing Alkynes. J. Chem.Soc. Dalton Trans., 17, 2963 (1999).
  • H. Hou, V. Fan, C. Du, Y. Zhu, W. Wang, X. Xin, K. M. Low, W. Ji and H G Ang. Strong Optical Limiting (OL) Capability of the Two-dimensional Network Cluster Polymer [MoS4Cu4I4(Py)4]n. J. Chem. Soc. Chem. Commun., 7, 647-648 (1999).