2-Aminopyrimidine(2AP)-succinic acid (SA) 1:1 cocrystal, C4HsN3.C4H604, Mr=213.19, = = 13.426 ( monoclinic, P21/n, a 5.045 (4), b 5), c = 15.148 (5)/1,, fl = 95.45 (5) °, V= 1021 (2) A 3~ Z= 4, Dx = 1.39 g cm -3,

We have synthesized [Pt(CN-iso-C 3 H 7 ) 4 ][M(CN) 4 ] (M ) Pt, Pd) and studied their reversible hydration and sorption properties with UV-vis, FT-IR spectroscopy, and X-ray diffraction. Powder diffraction studies show that anhydrous [Pt(CN-iso-C 3 H 7 ) 4 ][Pt(CN) 4 ] and [Pt(CN-iso-C 3 H 7 ) 4 ][Pd(CN) 4 ] crystallize in a tetragonal space group with nearly identical lattice constants. Gravimetric studies reveal that variable guest-host stoichiometries occur when solid [Pt(CN-iso-C 3 H 7 ) 4 ][Pt(CN) 4 ] sorbs the guest at room temperature from the gas phase [water, 12.1(1) molecules per formula unit, chloroform 6.0(1), methanol 8.0(1), and trifluoroethanol 4.1(1)]; these sorption processes are reversible. The unit cell distances in the tetragonal ab-plane expand dramatically when the solvent guests are sorbed, but changes along the c-axis (the M-M direction) are minimal. Crystallization of [Pt(CN-iso-C 3 H 7 ) 4 ][Pt(CN) 4 ] from water gives monoclinic crystals of a hexadecahydrate [Pt(CN-iso-C 3 H 7 ) 4 ][Pt(CN) 4 ]‚16H 2 O. This salt consists of alternating cation/anion chains along b with an average Pt-Pt distance of b/2 ) 3.1521(1) Å. The sixteen water molecules per formula weight interlace neighboring chains via H-bonding with each other and the CNions of the Pt(CN) 4 2units. The shifts in the UV-vis and IR spectra that occur when solvent guests are sorbed by the double complex salts are discussed in terms of the lattice expansions that are observed. A mechanism for the lattice expansions that accompany the sorption of guest molecules is proposed.

A new synthetic procedure developed recently in our laboratories has made possible the synthesis of variety of new complexes of CuCN with diamines. Synthesis was effected by adding the ligand to a solution of CuCN in aqueous sodium thiosulfate. This procedure also provides an alternative pathway to a novel diamine complex reported by us previously, (CuCN)(3)(HMTA)(2) (1) (where HMTA = hexamethylenetetramine). The other diamine ligands used were 1,4-diazabicyclo[2.2.2]octane (dabco), 1,4-dimethylpiperazine (dmpip), piperazine (pip), 1,4-butanediamine (butda), N,N,N',N'-tetramethylethylenediamine (tetmen), and N-phenylpiperazine (phpip). Complex2, Cu(2)(CN)(3)(dabco-H), crystallizes in the hexagonal space group P6(3) with unit cell dimensions a = 8.174(3) Å, c = 8.083(4) Å, and Z = 2. Complex 3, (CuCN)(2)(dmpip), crystallizes in the monoclinic space group C2/m with unit cell dimensions a = 8.812(3) Å, b = 9.631(2) Å, c = 7.266(3) Å, beta = 113.40(3) degrees, and Z = 2. Complex 4, (CuCN)(2)(pip), crystallizes in the monoclinic space group C2/c with unit cell dimensions a = 9.439(3) Å, b = 10.561(2) Å, c = 8.870(3) Å, beta = 98.32(3) degrees, and Z = 4. Complex 5, Cu(2)(CN)(3)(pip-H), crystallizes in the monoclinic space group C2/c with unit cell dimensions a = 20.573(9) Å, b = 8.354(2) Å, c = 15.989(6) Å, beta = 133.70(3) degrees, and Z = 8. Complex 6, (CuCN)(2)(butda), crystallizes in the monoclinic space group P2(1)/c with unit cell dimensions a = 10.456(2) Å, b = 5.550(1) Å, c = 8.669(3) Å, beta = 106.80(2) degrees, and Z = 2. Complex 7, (CuCN)(2)(tetmen), crystallizes in the orthorhombic space group Cmc2(1) with unit cell dimensions a = 11.889(4) Å, b = 33.380(8) Å, c = 9.012(3) Å, and Z = 12. Complex 8, (CuCN)(phpip), crystallizes in the monoclinic space group P2(1)/cwith unit cell dimensions a = 17.8819(3) Å, b = 6.9190(1) Å, c = 8.6972(1) Å, beta = 96.720(1) degrees, and Z = 4.

The continuous absorption spectra for gaseous Cl2, Br2, BrCl, IC1, and IBr between 220 and 600 µ are reported. The experimental data have been fitted to theoretical curves of the type suggested by Sulzer and Wieland. The parameters for these curves are given.