Red and Orange Polymorphs of [Pt(terpy)Cl]Cl·2H2O

Autor: Kent R. Mann, Daron E. Janzen
Rok vydání: 2013
Předmět:
Zdroj: Journal of Chemical Crystallography. 43:292-298
ISSN: 1572-8854
1074-1542
DOI: 10.1007/s10870-013-0419-9
Popis: The crystal structures of new red (1) and orange (2) polymorphs of chloro(2,2′:6′2″-terpyridine)-platinum(II) chloride dihydrate, [Pt(terpy)Cl]Cl·2H2O, have been determined by single crystal X-ray diffraction. Compound 1 packs in a one-dimensional stacking structure with two unique intermolecular Pt···Pt distances (3.3278(5) A, 3.4444(5) A). The principal difference between this red polymorph and a previously reported yellow polymorph is in the cation stacking motif. This red polymorph has two alternating short intermolecular Pt···Pt distances while the yellow polymorph has one long and one short Pt···Pt distance. Channels between the cation stacks are occupied by a hydrogen-bonding network of water molecules and chloride anions. This red polymorph has a cation stacking motif similar to those found in a diverse collection of structures with different counterions and solvates of the chloro(2,2′:6′2″-terpyridine)-platinum(II) cation. The orange polymorph 2 possesses a stacking motif with two alternating long intermolecular Pt···Pt distances (4.2169(4) A, 5.1582(4) A). The hydrogen-bonding network involving the chloride counterions and water molecules differs significantly from either the red or yellow polymorphs as well. Structure 1: monoclinic, P 21/c, a = 12.2630(14) A, b = 6.7459(8) A, c = 20.121(2) A, β = 105.018(2)°, V = 1,607.7(3) A3, Z = 4, R 1 = 0.0338, wR 2 = 0.0665. Structure 2: monoclinic, P 21/c, a = 8.0236(7) A, b = 12.9393(1) A, c = 15.847(2) A, β = 101.068(7)°, V = 1,614.6(3) A3, Z = 4, R 1 = 0.0181, wR 2 = 0.0377. The crystal structures of new red (1) and orange (2) polymorphs of chloro(2,2′:6′2″-terpyridine)-platinum(II) chloride dihydrate, [Pt(terpy)Cl]Cl·2H2O show that the red polymorph stacks with two unique intermolecular Pt···Pt distances (3.3278(5) A, 3.4444(5) A) while the orange polymorph has no intermolecular Pt···Pt contacts less than 4.2 A.
Databáze: OpenAIRE
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