S. S. Krishnamurthy

Coordination chemistry of diphosphinoamine and cyclodiphosphazane ligands

The transition metal coordination and organometallic chemistry of acyclic diphosphazane ligands has grown rapidly in the last two decades and a stage has been reached that permits a delineation of similarities and contrasts with the chemistry of diphosphinomethane type ligands. Diphosphazane complexes of Group 10 metals (particularly those of Pd and Pt) have received much less attention than the analogous complexes of transition metals of other groups in the Periodic Table. The coordination chemistry of cyclodiphosphazanes has been investigated to a limited extent compared with that of their acyclic analogues. An attractive feature of the diphosphinoamine chemistry is the ease with which a range of ligands with different electronic and steric attributes can be synthesized by varying the substituents on both nitrogen and phosphorous.

Organometallic derivatives of diphosphinoamines, X2PN(R)PX2. Reactions with carbonyl derivatives of group 6 metals and iron pentacarbonyl. The crystal structures of [Mo(CO)4PhN(P(OPh)2)2] and [W(CO)4iPrN(PPh2)2]

The diphosphinoamines

Short-bite chiral diphosphazanes derived from (S)-α-methyl benzyl amine and their Pd, Pt and Rh metal complexes

X_2PN(R)PX_2 (L) (R = Me or Ph, X = OCH_2CF_3

Nuclear Magnetic Resonance of Cyclophosphazenes

or OPh;

Spirocyclic phosphazenes derived from the reaction of N3P3Cl6 and N4P4Cl8 with bifunctional reagents

R = Ph, X = OC_6H_4Br-p; R = ^iPr, X = Ph)

Rhodium(I) complexes of α-keto-stabilised 1,2-bis(diphenylphosphino)alkane mono ylides ¶

react with group 6 metal carbonyl derivatives to yield the cis-chelate complexes [M(CO)4(L-PP′)]. The structures of cis-

Phosphazenes and Phosphazanes—The Nature of the P-N Bond

[Mo(CO)_4PhN(P(OPh)_2)_2]

SYNTHETIC, SPECTROSCOPIC AND CRYSTALLOGRAPHIC STUDIES OF HETEROFUNCTIONAL DIPHOSPHAZANE LIGANDS

(3d) and cis

Late transition metal complexes derived from diphosphazane monosulfide ligands: X-ray crystal structures of [Ru3(μ-CO)(CO)7(μ3-S){Ph2PN((S)-*CHMePh)PPh2-κ2P,P}] and [Rh(CO)Cl{Ph2PN((S)-*CHMePh)P(S)Ph2}-κ2P,S] ☆: Part 16. Organometallic chemistry of diphosphazanes

-[W(CO)_4\hspace{1mm}^iPrN(PPh_2)_2]

Amino acid-lanthanide interactions—2. The X-ray crystal structures of lanthanide and calcium complexes of 1-amino cyclohexane-1-carboxylic acid (Acc6), [Nd2(Acc6)6(H2O)6](ClO4)6·(H2O)6 (1), [Er2(Acc6)4(H2O)8](ClO4)6·(H2O)11 (2) and [Ca5(Acc6)12(H2O)6](ClO4)10·(H2O)4 (3)

(4f) have been established by single crystal X-ray diffraction studies. Reactions with iron pentacarbonyl yield complexes in which a chelating or a bridged-bidentate mode of coordination of the ligands is observed.