1037. The crystal structure of monopyridinecopper(II) acetate

Five-coordinate adducts of cupric β-diketone complexes: the structure of 4-methylpyridine bis-(o-hydroxyacetophenonato)copper(II)

“…It also compares well with the Cu-N bond lengths found in the two crystalline forms of pyridine copper acetate, i.e. 2-13 A in the monoclinic form (Barclay & Kennard, 1961) and 2.19 A in the orthorhombic form (Hanic, ,gtempelov~i & Hanicov~i, 1964).…”

The crystal and molecular structure of carbonatodiamminecopper(II), Cu(NH3)2CO3

“…The Cu-N bond lengths of 1.971 (2) and 1.984 (2),~, are similar to the copper-ammine nitrogen distances found in sulfato and selenatotetraamminecopper(II) (Morosin, 1969), diammine-(o-phthalato)copper(lI) (Cingi, Guastini, Musatti & Nardelli, 1970), diazidodiamminecopper-(II) (Agrell, 1966), hexaamminecopper(II)chloride (Distler & Vaughan, 1967), di-/z-hydroxobis(dimethylamine)copper(II) sulfate monohydrate (Iitaka, Shimizu & Kwan, 1966), bis(ethylenediamine)copper(II) thiocyanate (Brown & Lingafelter, 1964), and nitrate (Komiyama & Lingafelter, 1964) as well as in other molecules, all of which fall in the range 1.97 to 2.07/~,. The Cu-O(1) and Cu-O(3) bond lengths of 1.986 (2) and 1.989 (2) A are within the range of 1.88 to 2.03 A found in monopyridinecopper acetate (Barclay & Kennard, 1961), copper acetate monohydrate (van , acetylactone-mono-(ohydroxyanil)copper(lI) (Barclay & Hoskins, 1965), azurite, CH3(OH)2(CO3) 2 (Gattow & Zemann, 1958), and other related molecules. The closest through-space Cu-Cu approach of 3.500 (1) A is considerably longer than the values of 2.63 to 2.99 A found for Cu-Cu bonds in copper dimers Barclay & Kennard, 1961;Barclay & Hoskins, 1965), but it is not greatly different from the value of 3.722 A which we have recently found for the nonbonded Cu-Cu approach in the Cu2C14-dimer (Hodgson, Hale & Hatfield, 1971).…”

“…The Cu-O(1) and Cu-O(3) bond lengths of 1.986 (2) and 1.989 (2) A are within the range of 1.88 to 2.03 A found in monopyridinecopper acetate (Barclay & Kennard, 1961), copper acetate monohydrate (van , acetylactone-mono-(ohydroxyanil)copper(lI) (Barclay & Hoskins, 1965), azurite, CH3(OH)2(CO3) 2 (Gattow & Zemann, 1958), and other related molecules. The closest through-space Cu-Cu approach of 3.500 (1) A is considerably longer than the values of 2.63 to 2.99 A found for Cu-Cu bonds in copper dimers Barclay & Kennard, 1961;Barclay & Hoskins, 1965), but it is not greatly different from the value of 3.722 A which we have recently found for the nonbonded Cu-Cu approach in the Cu2C14-dimer (Hodgson, Hale & Hatfield, 1971).…”

The crystal structure of di-μ-hydroxo-bis(N,N,N',N'-tetramethylethylenediamine)dicopper(II) bromide

“…Bond lengths and angles along with their standard deviations are shown in Fig. 1 (Kitbourn & Dunitz, 1967) which also have bridging oxygen atoms, and is shorter than the Cu-O distances in Cu2(OH)3Br (2.00 and 2.02/k), CuC12.2H20 (1"93/~), KzCuC14.2H20 (1"97/~) (Wells, 1962) and anhydrous copper(II) formate (1.99/~) (Barclay & Kennard, 1961). The Cu-N bond length of 2.030 A and N-Cu-N angle of 86.7 ° are normal for ethylenediamine complexes (Brown & Lingafelter, 1964;Komiyama & Lingafelter, 1964) and for complexes with ligands based on an ethylenediamine type of linkage (Llewellyn & Waters, 1966).…”

“…The 3.000 A Cu-Cu distance in [Cu2(OH)2(tmen)2]Br2 is rather characteristic of dimeric copper(II) compounds (Schlafer, Morrow & Smith, 1965;Sager, Williams & Watson, 1967;Kilbourn & Dunitz, 1967;Bertrand, 1967;Barclay & Ken_nard, 1961;Barclay & Hoskins, 1965;Wallwork & Addison, 1965;Schlueter, Jacobsen & Rundle, 1966) not having the copper(II) acetate monohydrate type of structure (van Niekerk & Schoening, 1953;Barclay & Kennard, 1961;Hanic, Stempelov~i & Hanicov~i, 1964;Chidambaram & Brown, 1965;O'Connor & Maslen, 1966;Manojlovi6-Mnir, 1967). In the latter structure the Cu-Cu distance of about 2-63/~ is presumably responsible (Figgis & Martin, 1956) for weak g-bond formation which causes the subnormal magnetic moments observed for such compounds.…”