Terminal and new bridging coordination of methylguanidine, arginine, and canavanine to platinum(II). The first crystallographic study of bonding between a transition metal and a guanidine ligand

Journal Article · Wed Mar 07 04:00:00 EST 1990 · Inorganic Chemistry; (USA)

DOI:https://doi.org/10.1021/ic00330a006· OSTI ID:7121578

Ratilla, E M.A.; Scott, B K; Moxness, M S; Kostic, N M ^[1]

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1. Iowa State Univ., Ames (USA)

The compound (Pt(trpy)Cl)Cl reacts with the guanidine-containing compounds methylguanidine, arginine, and canavanine to form the yellow monometallic complexes (Pt(trpy)MeGua){sup 2+}, (Pt(trpy)ArgH){sup 2+}, and (Pt(trpy)CanH){sup 2+} and the red bimetallic complexes ((Pt(trpy)){sub 2}MeGua){sup 4+}, ((Pt(trpy)){sub 2}Arg){sup 3+}, and ((Pt(trpy)){sub 2}Can){sup 3+}. The yellow and the red complexes containing each of the three ligands are separated by cation-exchange chromatography, and the corresponding PF{sub 6}{sup {minus}}, ClO{sub 4}{sup {minus}}, and BPh{sub 4}{sup {minus}} salts are isolated by precipitation. The stability of the complexes upon heating and acidification and the relative difficulties of displacement of the guanidine ligands are studied semiquantitatively. The compositions of the new complexes are determined by mass, uv-vis, ir, and {sup 1}H, {sup 13}C, and {sup 195}Pt NMR spectroscopy. In the yellow complexes, each guanidine ligand probably binds to a Pt(trpy){sup 2+} group through a trigonal (imino-type) nitrogen atom. In the red complexes, each guanidine ligand bridges two Pt(trpy){sup 2+} groups, probably through a tetrahedral (amino-type)and a trigonal nitrogen atom. Results of the crystallographic study of ((Pt(trpy)){sub 2}Can)(ClO{sub 4}){sub 3} {times} 5.5H{sub 2}O are reported. 44 refs., 2 figs., 6 tabs.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 7121578
• Journal Information: Inorganic Chemistry; (USA), Journal Name: Inorganic Chemistry; (USA) Vol. 29:5; ISSN 0020-1669; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMINO ACIDS
ARGININE
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CHEMICAL BONDS
COMPLEXES
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
GUANIDINES
INFORMATION
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PLATINUM COMPLEXES
TRANSITION ELEMENT COMPLEXES