Crystal hydrates bond distances

Crystal field splitting parameter, 2, 309 Crystal field theory, 1, 215-221 angular overlap model, 1, 228 calculations, 1, 220 generality, 1,219 low symmetry, 1,220 /-orbital, 1, 231 Crystal hydrates, 2, 305,306 bond distances, 2, 307 Crystals... 

Fig. 20.5 a, b. Schematic representation of hydration of a G-T wobble base pair in the Z-DNA type crystal structure of d(CGCGTG). Hydrogen-bonding distances to water molecules (W) and C(l )- -C(l ) distances given in A units. Left hydration is only by water molecules right hydration involves a cluster [Mg(H20)6]2+ [683]... 

PBSQ crystallizes in a hydrated form, PBSQ 2H2O, and the crystal is characterized by a layered structure, consisting of one-dimensional hydrogen-bonded chains of PBSQ molecules (Fig. 25). The hydrogen-bond distance is very short (2.48 A), even compared with that of squaric acid (2.55 A). The incorporated water molecules form dimers, and they are located perpendicular... 

Fig. 18. The bond distances (A) and bond angles (degrees) in 2-thiouracil, 4-thiouraoil, and 2,4-dithiouracil, obtained by averaging of results from crystal structure containing the bases 2-thiouracil (cf. ref. 492), 4-thiouracil (1-methyl-thiouracil 9-methyl-adenine, 4-thiouridine hydrate, 1,- )3-Z)-arab-inofuranosyl-4-thiouracil, 3 -0-acetyl-4-thiothymidine 2,4-dithiouracil...

Naslund L-A, Edwards DC, Wemet P et al (2005) X-ray absorption spectroscopy study of the hydrogen bond networkin the bulk water of aqueous solutions. J Phys Chem A 109 5995-6002 Drakin SI (1963) Me—H2O distances in crystal hydrates and radii ofions in aqueous solution. J Struct Chem 4 472-478... 

The most adequately characterized hydrazinium complexes consisting of coordinated metal ions are (N2H5)2M(S04)2 (M = Mg, Mn, Fe, Co, Ni, Cu, Zn, Cd, and the halides) [31]. In addition, single crystals have been analyzed of Co and Ni double sulfates synthesized under hydrothermal conditions using metal sulfates, hydrazine hydrate, and HF [32]. Table 1.8 lists various hydrazinium compounds along with their crystal data and N—N bond distances. 

Crystals of uranyl perchlorate, U02(C10[13093-00-0] have been obtained with six and seven hydration water molecules. The uranyl ion is coordinated with five water molecules (4) in the equatorial plane with a U—O(aquo) distance of 245 nm (2.45 E). The perchlorate anion does not complex the uranyl center. The unit cells contain two [0104] and one or two molecules of hydration water held together by hydrogen bonding (164). 

---